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♪♪

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-The oceans
are full of wonder,

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an alien world
waiting to be explored.

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A place of
extraordinary life-forms

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with intriguing social lives

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and incredible intelligence.

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[ Dolphin squeaking ]

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To reveal their secrets,

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a hidden team goes undercover.

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Spy creatures.

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♪♪

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The most innovative
undersea robots in the world.

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They not only look like
the animals they film,

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they interact with them
as no human can.

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♪♪

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Equipped with hidden cameras...

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♪♪

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...they reveal
their astonishing lives.

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As our spies join
their undersea world,

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they shed light on some of
the mysteries of the deep.

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♪♪

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♪♪

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-On our spies' latest mission,

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they reveal
the extraordinary relationships

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that exist among
the creatures of the ocean.

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♪♪

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In Australia, an astonishing
event is underway.

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Cued by the full moon,

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spider crabs rise up
from the abyss deep below.

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To reveal what's going on,
Spy Crab joins the march.

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Eight robotic legs
give the traction it needs.

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♪♪

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Like the real thing, a hard
shell protects its innards --

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in this case, a camera.

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Over the next two weeks,

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thousands upon thousands
of these

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usually solitary creatures
will gather.

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Then, a hint at why
they're here.

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Spy Crab discovers that some
are emerging from their shells.

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♪♪

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Squeezing out
can take 15 minutes or more.

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♪♪

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Enzymes oil the process,
helping her slip away.

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♪♪

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Freed from what's
become a prison,

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she now has space to grow.

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♪♪

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Her new shell
will take weeks to harden.

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Until then, she'll hide
among the better protected.

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For now, she'll make do
with our spy.

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She has good reason
to hide away.

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There are plenty
out to get her.

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A 13-foot stingray can eat
50 crabs a day.

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They vacuum up
any who've lost their shell.

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Our spy becomes
the crab's defender.

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♪♪

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The ray will look
for an easier meal.

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Those with hard shells
aren't worth the trouble.

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Males even stand and fight.

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Those with soft shells
hide among the hordes.

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Despite their brave defenders,
the ray can hunt them down.

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It makes short work
of separating meat from shell.

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The crab-in-hiding
makes her getaway.

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She needs to get lost
in the crowd.

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The ray's victim
is just an empty husk.

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But the ray is yet to satisfy
his 50-a-day appetite.

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And the fleeing crab
is still in the open.

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♪♪

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She's made it.

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Now, to vanish
among the masses.

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The greater the numbers,
the harder it is for the ray.

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♪♪

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Those with hard shells
form an armored fortress,

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with the soft-shelled
hidden beneath.

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♪♪

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Left in the open, Spy Crab
is now a sitting target.

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It gets
the full death-ray treatment.

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♪♪

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A crab's-eye view
of an untimely end.

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♪♪

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But it's still
live and kicking.

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And it's not over yet.

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♪♪

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This time,
the ray did it a favor!

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Back firmly
on its own eight feet,

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our spy heads to the fortress.

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It has a tower of crustaceans
to climb.

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But there's no need.

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The crabs come to our spy.

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♪♪

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They create a shield
of legs and armor --

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a living citadel
built on sand

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and a brief monument
to the strength of teamwork.

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Many sea creatures have
found value in being together.

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Sharks may have a reputation
as solitary killers,

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but many are
surprisingly social.

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Scalloped hammerheads are among
the most sociable of all.

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They travel in their hundreds
as they head

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to a remote island 300 miles
off the coast of Colombia.

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Today, they have a spy
in their midst.

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A mechanical marvel,
propelled by its sharklike tail.

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It hardly makes a sound,

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vital when filming these
surprisingly shy creatures.

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♪♪

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As well as a camera
in each eye...

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it has another in its fin,

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one with 360 vision.

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♪♪

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It can even film
through its jaws.

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♪♪

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Our spy has much to reveal.

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Most of these hammerheads
are female,

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with the largest in the middle
and the smallest outside.

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Some even choose a travel
companion for their journey.

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♪♪

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They're all swimming
towards a special destination.

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Malpelo is a magnetic anomaly.

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A place where the earth's
magnetic field

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is distorted by the rocks below.

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Hammerheads use
the magnetic field as a compass,

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so this place
has unseen significance.

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They gather here,

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having returned
from their feeding grounds.

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They are met by
a surprising welcoming party --

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king angelfish that provide
a personal grooming service

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to these would-be killers.

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♪♪

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Wounds are attended to
and parasites removed.

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♪♪

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Hammerheads feed
in the deep ocean,

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so the angelfish here
are safe.

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While they get a meal,
the sharks enjoy a makeover.

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♪♪

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In this topsy-turvy world,

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fish seem to like sharks so much
even our spy gains a following.

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♪♪

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Galapagos sharks
also visit this undersea spa

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and receive
the same warm welcome.

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♪♪

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Pilot fish cluster around
the shark's jaws

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but are never taken.

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Instead, they benefit
from the shark's protection.

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In return, they clean its teeth
and gain a meal in the bargain.

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Rainbow chub
are also shark lovers

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They rub themselves on
the shark's serrated scales...

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...a trick thought
to scrape off parasites.

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In this place
of apparent harmony,

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other intriguing relationships
can be found.

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Spy Moray Eel joins the team.

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Like the real thing,
it moves silently.

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Its mechanical spine creates
the waves that propel its body.

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This is what it came to see.

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A community of moray eels.

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Despite their ghoulish looks
and razor-sharp teeth,

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they live in relative harmony.

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♪♪

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Spy Moray is here to study
the partnership they share.

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Their unlikely partners
are leather bass groupers.

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Our robotic moray soon
attracts their attention.

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For the fish are here
to wake up the eels.

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Their snooze alarm
could hardly be gentler.

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But, one by one, they stir.

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The groupers signal
it's time to follow.

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♪♪

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With some gentle encouragement,
the eels oblige.

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♪♪

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To discover the reason,
Spy Moray follows behind.

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♪♪

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They're heading to a spot

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the fish have
checked out before.

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♪♪

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A place where smaller fish
are hiding.

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A headstand marks the spot.

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A signal to the eels.

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And they slink in where groupers
can't and flush out the fish.

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There's one.

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00:15:02,866 --> 00:15:05,533
Then another!

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And another.

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Most are too quick to catch.

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♪♪

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00:15:16,933 --> 00:15:22,900
But in the scrum, there's enough
for both groupers and eels,

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despite the ones that get away.

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00:15:27,933 --> 00:15:32,533
It's a perfect relationship
where both gain.

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00:15:32,533 --> 00:15:36,533
But Spy Moray is experiencing
a technical malfunction...

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[ Mechanical whirring ]

186
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...a loss of transmission.

187
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But still keeps filming.

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The groupers act as if our spy
is part of the hunt

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and has found something.

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Soon our spy is
completely smothered.

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00:16:04,200 --> 00:16:07,300
But help has arrived.

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A spy to shepherd them away.

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00:16:14,633 --> 00:16:18,566
The signal
finally gets through.

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00:16:18,566 --> 00:16:21,566
Like others
in this undersea community,

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00:16:21,566 --> 00:16:25,433
our spies
can use teamwork too.

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In the oceans,

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00:16:31,200 --> 00:16:34,833
working in partnership
is surprisingly common.

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00:16:34,833 --> 00:16:40,266
For bottlenose dolphins,
it's a way of life.

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To strengthen the bonds
between them,

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they spend
a lot of time at play.

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To find out who else might join
their games,

202
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Spy Pelican follows
from above,

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00:16:55,700 --> 00:16:58,666
while Spy Dolphin films
from below.

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00:17:01,933 --> 00:17:04,833
Together,
our roving spy creatures

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00:17:04,833 --> 00:17:07,400
find a possible playmate.

206
00:17:11,000 --> 00:17:13,233
A southern right whale.

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00:17:15,533 --> 00:17:19,600
A species not known
for its fun-loving lifestyle.

208
00:17:22,966 --> 00:17:25,766
It will need some coaxing.

209
00:17:27,300 --> 00:17:29,166
Something to get it
in the mood.

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00:17:31,766 --> 00:17:34,500
Already,
it seems to be working.

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00:17:34,500 --> 00:17:40,000
♪♪

212
00:17:40,000 --> 00:17:42,600
Some dolphins
show their bellies --

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00:17:42,600 --> 00:17:44,033
a sign they want to play.

214
00:17:44,033 --> 00:17:50,100
♪♪

215
00:17:50,100 --> 00:17:52,433
The whale even attempts a leap.

216
00:17:56,500 --> 00:17:59,766
The dolphins have the playmate
they're after.

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00:17:59,766 --> 00:18:06,300
♪♪

218
00:18:06,300 --> 00:18:09,833
But who can compete
with a dolphin?

219
00:18:09,833 --> 00:18:15,266
♪♪

220
00:18:15,266 --> 00:18:18,033
The whale does his best.

221
00:18:18,033 --> 00:18:39,400
♪♪

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00:18:39,400 --> 00:18:41,833
Another whale joins.

223
00:18:41,833 --> 00:18:45,466
It's now double the fun.

224
00:18:45,466 --> 00:18:46,733
[ Dolphin squeaking ]

225
00:18:46,733 --> 00:18:59,700
♪♪

226
00:18:59,700 --> 00:19:01,900
Still more arrive.

227
00:19:01,900 --> 00:19:17,966
♪♪

228
00:19:17,966 --> 00:19:23,133
But you can have too much
of a good thing.

229
00:19:23,133 --> 00:19:26,400
The dolphins decide
it's time to leave.

230
00:19:29,533 --> 00:19:32,600
To discover that whales
and dolphins play together

231
00:19:32,600 --> 00:19:34,433
is a revelation.

232
00:19:37,266 --> 00:19:42,233
For our spies, there are always
new surprises to uncover.

233
00:19:42,233 --> 00:19:43,966
[ Whale singing ]

234
00:19:51,966 --> 00:19:54,866
Even sociable creatures
like manatees

235
00:19:54,866 --> 00:19:57,633
can't always choose
who they mix with.

236
00:20:00,266 --> 00:20:04,466
Spy Manatee is now fully
accepted into the group.

237
00:20:05,500 --> 00:20:07,033
[ Manatee chirps ]

238
00:20:07,033 --> 00:20:12,500
It's discovering that even here
they have friends they like,

239
00:20:12,500 --> 00:20:15,666
and then there are
the hangers-on.

240
00:20:18,300 --> 00:20:22,200
Latched onto her body
are remora fish.

241
00:20:23,900 --> 00:20:29,733
Totally harmless, their
relationship is extraordinary.

242
00:20:29,733 --> 00:20:33,233
They feed on skin flakes
and parasites

243
00:20:33,233 --> 00:20:36,200
and whatever the manatee poos.

244
00:20:36,200 --> 00:20:40,233
What was once a fin has evolved
into a suction pad

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00:20:40,233 --> 00:20:41,700
on their heads.

246
00:20:41,700 --> 00:20:44,833
As well as food,

247
00:20:44,833 --> 00:20:48,500
the manatees provide an
energy-saving way to get around,

248
00:20:48,500 --> 00:20:51,933
while keeping water flowing
through the remoras' gills.

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00:20:51,933 --> 00:21:11,533
♪♪

250
00:21:11,533 --> 00:21:15,333
Those on top travel upside down.

251
00:21:17,566 --> 00:21:22,333
If they move to the belly,
they're more easily shooed away.

252
00:21:24,300 --> 00:21:27,900
Even so, there's always
another free ride.

253
00:21:30,833 --> 00:21:33,600
While remora
can be a nuisance,

254
00:21:33,600 --> 00:21:36,800
sergeant major fish
are welcomed.

255
00:21:38,066 --> 00:21:42,633
Our spy investigates why
they're accepted so readily.

256
00:21:46,466 --> 00:21:50,300
The fish provide
a cleaning service.

257
00:21:52,333 --> 00:21:56,300
They graze on the algae that
grows on the manatee's skin.

258
00:21:56,300 --> 00:22:09,666
♪♪

259
00:22:09,666 --> 00:22:14,233
For a full-body treatment,
manatees strike a pose,

260
00:22:14,233 --> 00:22:18,766
letting the fish tackle
those hard-to-reach places.

261
00:22:20,933 --> 00:22:25,166
It sends them
into a state of bliss...

262
00:22:26,733 --> 00:22:29,633
...until they nod off.

263
00:22:29,633 --> 00:22:39,266
♪♪

264
00:22:39,266 --> 00:22:44,233
The spa is popular.
Everyone wants a makeover.

265
00:22:44,233 --> 00:22:52,633
♪♪

266
00:22:52,633 --> 00:22:56,166
But not all the fish here
are friendly.

267
00:22:58,966 --> 00:23:02,866
Nurse sharks patrol
the coral heads,

268
00:23:02,866 --> 00:23:06,300
while stingrays search
the sandy seabed.

269
00:23:08,000 --> 00:23:12,933
These predators could be
the ultimate test for our spy.

270
00:23:12,933 --> 00:23:25,100
♪♪

271
00:23:25,100 --> 00:23:29,500
Rays and sharks can detect
electromagnetic signals.

272
00:23:32,766 --> 00:23:36,666
Spy Manatee
has plenty of those.

273
00:23:36,666 --> 00:23:41,766
♪♪

274
00:23:41,766 --> 00:23:44,300
An exploratory nibble.

275
00:23:48,600 --> 00:23:51,100
But there's nothing here
to be found.

276
00:23:54,766 --> 00:23:59,733
Like most of our spies,
Spy Manatee attracts the curious

277
00:23:59,733 --> 00:24:01,833
rather than the aggressive.

278
00:24:09,266 --> 00:24:12,400
In Indonesia, Spy Hammerhead

279
00:24:12,400 --> 00:24:15,200
continues its own
journey of discovery.

280
00:24:17,533 --> 00:24:20,000
It soon finds that
across the ocean

281
00:24:20,000 --> 00:24:22,833
similar partnerships
have evolved.

282
00:24:24,966 --> 00:24:28,933
Here it's cleaner wrasse
that take on cleaning duties.

283
00:24:28,933 --> 00:24:34,933
They even act
as dental hygienists,

284
00:24:34,933 --> 00:24:37,000
with trapped food the reward.

285
00:24:41,066 --> 00:24:44,800
But these pearly whites
have nothing to offer.

286
00:24:50,700 --> 00:24:54,766
An olive sea snake
shows his inquisitive side.

287
00:24:54,766 --> 00:24:59,166
He's one of the most venomous
snakes in the world.

288
00:25:00,733 --> 00:25:04,433
Today, he's on the hunt.

289
00:25:07,066 --> 00:25:11,100
He can hold his breath
for up to two hours --

290
00:25:11,100 --> 00:25:13,866
useful when searching
for a meal.

291
00:25:16,233 --> 00:25:19,366
He's after the fish
that hide in the coral.

292
00:25:22,700 --> 00:25:26,766
To catch them, he needs help.

293
00:25:26,766 --> 00:25:32,100
And on the reef,
support is rarely far away.

294
00:25:32,100 --> 00:25:35,500
A female who's also hunting.

295
00:25:35,500 --> 00:25:44,066
♪♪

296
00:25:44,066 --> 00:25:45,766
Like moray eels,

297
00:25:45,766 --> 00:25:49,866
the snakes have formed
a partnership with a fish.

298
00:25:49,866 --> 00:25:55,300
But here it's trevally who know
where food can be found.

299
00:25:55,300 --> 00:26:02,233
♪♪

300
00:26:02,233 --> 00:26:07,466
When they arrive, the trevally
show them where to look.

301
00:26:07,466 --> 00:26:14,633
Like moray eels, snakes
can go where others can't.

302
00:26:14,633 --> 00:26:18,366
But these snakes
have a problem.

303
00:26:18,366 --> 00:26:21,100
They aren't
the only ones hunting.

304
00:26:23,100 --> 00:26:27,200
Soon there are too many
after the same meal.

305
00:26:29,633 --> 00:26:34,933
The snakes and trevally
grab what they can.

306
00:26:34,933 --> 00:26:37,700
But there's a limited supply.

307
00:26:37,700 --> 00:26:42,833
This partnership works best
with fewer numbers.

308
00:26:42,833 --> 00:26:47,100
Today, there's not enough fish
to go around.

309
00:26:47,100 --> 00:26:51,133
But the snake couple
won't go unrewarded,

310
00:26:51,133 --> 00:26:56,666
it's now a relationship
of a more amorous kind.

311
00:26:56,666 --> 00:26:59,300
They head to the surface...

312
00:27:03,066 --> 00:27:08,200
...joining together
in a serpentine embrace.

313
00:27:10,633 --> 00:27:14,466
One that briefly forms
a fitting symbol.

314
00:27:14,466 --> 00:27:46,566
♪♪

315
00:27:46,566 --> 00:27:49,733
They'll stay entwined
for up to an hour

316
00:27:49,733 --> 00:27:52,233
before going
their separate ways.

317
00:28:00,066 --> 00:28:03,433
Of all the relationships
found in the ocean,

318
00:28:03,433 --> 00:28:07,133
few can beat
the spinner dolphins.

319
00:28:07,133 --> 00:28:10,100
As well as gathering
in huge numbers,

320
00:28:10,100 --> 00:28:13,600
they are the acrobats
of the dolphin world.

321
00:28:19,266 --> 00:28:24,633
They can leap over 10 feet high
and spin seven times in a jump.

322
00:28:32,033 --> 00:28:35,400
Today they're on
a hunting expedition.

323
00:28:37,800 --> 00:28:41,633
Spy Dolphin is here to find out
how they work as a team.

324
00:28:48,066 --> 00:28:52,300
Their bubbles provide a clue.

325
00:28:52,300 --> 00:28:54,400
On closer inspection,

326
00:28:54,400 --> 00:28:58,500
they plainly come
from the dolphin's blowholes.

327
00:28:58,500 --> 00:29:02,333
A sign they are whistling
to each other.

328
00:29:02,333 --> 00:29:03,966
[ Dolphins whistling ]

329
00:29:06,700 --> 00:29:09,866
They use these calls
to bring the pod together.

330
00:29:13,333 --> 00:29:17,800
They also have a unique whistle
to announce who they are --

331
00:29:17,800 --> 00:29:20,400
the dolphin equivalent
of a name.

332
00:29:20,400 --> 00:29:22,366
[ Dolphins whistling ]

333
00:29:22,366 --> 00:29:31,033
♪♪

334
00:29:31,033 --> 00:29:37,133
As well as whistles, they use
clicks to communicate too.

335
00:29:37,133 --> 00:29:42,600
Some clicks are ultrasonic,
far above our hearing range.

336
00:29:42,600 --> 00:29:44,966
All this works at close range,

337
00:29:44,966 --> 00:29:47,500
but to contact dolphins
far away

338
00:29:47,500 --> 00:29:50,700
they use
their corkscrew leaping.

339
00:29:52,533 --> 00:29:55,200
For an aerial view
of what's going on,

340
00:29:55,200 --> 00:29:58,266
Spy Frigate films from above.

341
00:30:02,600 --> 00:30:06,066
The leaps can be seen
by distant dolphins...

342
00:30:10,066 --> 00:30:14,000
...while the splashing
can be heard from far and wide.

343
00:30:14,000 --> 00:30:15,633
[ Dolphins whistling
and clicking ]

344
00:30:18,533 --> 00:30:22,266
United, they can hunt
as a super team.

345
00:30:25,200 --> 00:30:30,200
Our spy is in the midst
of an extraordinary gathering...

346
00:30:32,766 --> 00:30:36,700
...one of the greatest mega pods
ever filmed.

347
00:30:36,700 --> 00:30:47,166
♪♪

348
00:30:47,166 --> 00:30:51,666
Spy dolphin is here to witness
this astonishing moment.

349
00:30:51,666 --> 00:30:55,100
And there's yet more
to discover.

350
00:30:55,100 --> 00:30:59,633
Yellowfin tuna also heard
the splashing

351
00:30:59,633 --> 00:31:02,433
and join the dolphins' quest
for a meal.

352
00:31:02,433 --> 00:31:12,333
♪♪

353
00:31:12,333 --> 00:31:15,633
As the dolphins and tuna
travel together,

354
00:31:15,633 --> 00:31:18,766
the ocean
becomes a superhighway.

355
00:31:18,766 --> 00:31:24,600
♪♪

356
00:31:24,600 --> 00:31:28,666
Above, frigate birds
join the travelers,

357
00:31:28,666 --> 00:31:31,866
including our spy version.

358
00:31:35,133 --> 00:31:40,366
As they near their goal,
the dolphins leap into action.

359
00:31:40,366 --> 00:31:47,433
♪♪

360
00:31:47,433 --> 00:31:51,433
A synchronized wave,
thousands strong.

361
00:31:51,433 --> 00:32:03,266
♪♪

362
00:32:03,266 --> 00:32:07,733
Spy Frigate records the moment
they close in on their target.

363
00:32:10,133 --> 00:32:13,400
A squadron of flying fish

364
00:32:13,400 --> 00:32:18,200
chased into the air
by the hunting dolphins.

365
00:32:21,000 --> 00:32:24,600
The tuna even try to grab them
as they fly.

366
00:32:24,600 --> 00:32:29,733
♪♪

367
00:32:29,733 --> 00:32:34,233
With dolphins and tuna
working together, few escape.

368
00:32:34,233 --> 00:32:57,633
♪♪

369
00:32:57,633 --> 00:33:01,233
The frigates too
take what they can.

370
00:33:01,233 --> 00:33:15,733
♪♪

371
00:33:15,733 --> 00:33:20,366
It's a feast made possible
by extraordinary teamwork.

372
00:33:20,366 --> 00:33:24,666
♪♪

373
00:33:24,666 --> 00:33:28,966
As the day ends,
they have reason to celebrate,

374
00:33:28,966 --> 00:33:32,066
and they do it
in true dolphin style.

375
00:33:32,066 --> 00:33:43,966
♪♪

376
00:33:43,966 --> 00:33:49,433
Off Mexico, shoals of mackerel
are gathering too.

377
00:33:49,433 --> 00:33:54,100
Upwellings of nutrients
have caused plankton to bloom.

378
00:33:57,133 --> 00:34:00,466
It's not only mackerel
that relish the feast.

379
00:34:00,466 --> 00:34:05,466
♪♪

380
00:34:05,466 --> 00:34:09,766
A tuna crab,
a type of squat lobster.

381
00:34:13,966 --> 00:34:16,666
It won't be alone for long.

382
00:34:16,666 --> 00:34:20,300
More are rising
from the depths.

383
00:34:20,300 --> 00:34:31,833
♪♪

384
00:34:31,833 --> 00:34:35,900
As always, there's a spy
for every occasion...

385
00:34:35,900 --> 00:34:40,633
♪♪

386
00:34:40,633 --> 00:34:44,266
...with a subject worthy
of special attention.

387
00:34:48,533 --> 00:34:53,600
Tuna crabs only come together
when conditions are perfect.

388
00:34:53,600 --> 00:35:06,800
♪♪

389
00:35:06,800 --> 00:35:11,933
They may all look the same, but
they are not short on character.

390
00:35:14,200 --> 00:35:16,933
A blade of sea grass covered
in plankton

391
00:35:16,933 --> 00:35:19,000
becomes something to fight over.

392
00:35:19,000 --> 00:35:29,600
♪♪

393
00:35:29,600 --> 00:35:32,366
It's now a tug of war...

394
00:35:32,366 --> 00:35:40,633
♪♪

395
00:35:40,633 --> 00:35:44,000
...with both
a winner and a loser.

396
00:35:46,433 --> 00:35:50,800
Spy Tuna Crab arrived
at a special moment,

397
00:35:50,800 --> 00:35:55,833
an event that has
rarely been filmed.

398
00:35:55,833 --> 00:36:02,600
♪♪

399
00:36:02,600 --> 00:36:05,833
Hundreds soon become thousands.

400
00:36:05,833 --> 00:36:10,800
Then thousands become millions.

401
00:36:10,800 --> 00:36:13,533
♪♪

402
00:36:13,533 --> 00:36:18,266
♪♪

403
00:36:18,266 --> 00:36:22,500
They devour all the plankton
they can.

404
00:36:22,500 --> 00:36:24,800
When they've had their fill,

405
00:36:24,800 --> 00:36:27,500
they descend to
the deep once more.

406
00:36:27,500 --> 00:36:31,266
Those that leave
are soon replaced,

407
00:36:31,266 --> 00:36:34,200
and so the cycle goes on.

408
00:36:34,200 --> 00:36:53,533
♪♪

409
00:36:53,533 --> 00:36:58,000
Such numbers have
seldom been seen.

410
00:36:58,000 --> 00:36:59,866
A magical moment

411
00:36:59,866 --> 00:37:03,300
before they vanish
into the depths once more.

412
00:37:03,300 --> 00:37:10,133
♪♪

413
00:37:10,133 --> 00:37:13,200
When autumn brings storms
to the Caribbean,

414
00:37:13,200 --> 00:37:16,200
another gathering begins.

415
00:37:20,500 --> 00:37:25,166
Spiny lobsters leave their
hideaways and start to assemble.

416
00:37:28,833 --> 00:37:33,433
They're preparing to migrate
to calmer and warmer waters.

417
00:37:35,866 --> 00:37:38,833
One has yet to join them.

418
00:37:38,833 --> 00:37:41,033
Another spy.

419
00:37:45,533 --> 00:37:49,366
As the storm builds,
conditions worsen.

420
00:37:49,366 --> 00:38:03,100
♪♪

421
00:38:03,100 --> 00:38:05,900
Alone, they're vulnerable --

422
00:38:05,900 --> 00:38:10,900
not just to currents,
but predators too.

423
00:38:10,900 --> 00:38:15,066
So they'll make
their journey together.

424
00:38:15,066 --> 00:38:17,633
Already Spy Lobster
has company.

425
00:38:17,633 --> 00:38:23,100
♪♪

426
00:38:23,100 --> 00:38:25,300
Others also couple up.

427
00:38:25,300 --> 00:38:30,966
♪♪

428
00:38:30,966 --> 00:38:34,233
Everyone joins
the great migration...

429
00:38:36,266 --> 00:38:39,900
...including our spy
and its newfound buddy.

430
00:38:43,666 --> 00:38:46,700
As the lobsters come together,

431
00:38:46,700 --> 00:38:49,733
it becomes a game
of follow the leader.

432
00:38:49,733 --> 00:38:54,966
♪♪

433
00:38:54,966 --> 00:38:59,333
Latecomers race to join up.

434
00:38:59,333 --> 00:39:01,466
Including our spy.

435
00:39:05,833 --> 00:39:08,933
A chain soon starts to form.

436
00:39:08,933 --> 00:39:21,566
♪♪

437
00:39:21,566 --> 00:39:24,500
It becomes a lobster conga line,

438
00:39:24,500 --> 00:39:27,366
their antennae
keeping each in line.

439
00:39:27,366 --> 00:39:34,833
♪♪

440
00:39:34,833 --> 00:39:38,433
The members
can number 50 or more.

441
00:39:38,433 --> 00:39:40,933
No one wants to be left behind.

442
00:39:40,933 --> 00:39:47,533
♪♪

443
00:39:47,533 --> 00:39:49,600
As they head for deeper water,

444
00:39:49,600 --> 00:39:54,266
walking in line reduces drag
and keeps them on course.

445
00:39:58,400 --> 00:40:01,100
Guided by the Earth's
magnetic field,

446
00:40:01,100 --> 00:40:03,966
they can march
like this for days.

447
00:40:03,966 --> 00:40:12,500
♪♪

448
00:40:12,500 --> 00:40:17,666
Already they are
vanishing into the deep,

449
00:40:17,666 --> 00:40:21,266
leaving Spy Lobster far behind.

450
00:40:27,500 --> 00:40:32,866
Shipwrecks are testament
to the power of the storms.

451
00:40:32,866 --> 00:40:36,200
They are now a refuge
for those sheltering

452
00:40:36,200 --> 00:40:38,300
from the turmoil above.

453
00:40:38,300 --> 00:40:42,566
♪♪

454
00:40:42,566 --> 00:40:45,866
Another place, another spy.

455
00:40:48,866 --> 00:40:52,433
This time -- Spy Nautilus.

456
00:40:52,433 --> 00:41:01,666
♪♪

457
00:41:01,666 --> 00:41:05,300
It finds that every
nook and cranny is occupied.

458
00:41:05,300 --> 00:41:08,466
With little shelter elsewhere,

459
00:41:08,466 --> 00:41:12,066
the wreck is a magnet
for the vulnerable.

460
00:41:12,066 --> 00:41:22,233
♪♪

461
00:41:22,233 --> 00:41:25,300
Spy Lobster joins the search.

462
00:41:32,666 --> 00:41:36,400
Then, a promising sign.

463
00:41:38,800 --> 00:41:42,933
Two lobsters hiding
beneath the broken bow.

464
00:41:42,933 --> 00:41:46,533
They're not the only ones.

465
00:41:46,533 --> 00:41:50,566
In every crevice,
more can be found.

466
00:41:56,233 --> 00:42:01,500
With no claws to protect them,
wrecks like this keep them safe.

467
00:42:03,833 --> 00:42:08,366
For them, the journey
has been worth it.

468
00:42:11,100 --> 00:42:13,333
Here they'll spend the winter

469
00:42:13,333 --> 00:42:16,433
until the shallows warm
once more.

470
00:42:16,433 --> 00:42:25,466
♪♪

471
00:42:25,466 --> 00:42:29,733
There is one place our spies
have yet to visit.

472
00:42:31,266 --> 00:42:33,066
The islands of the Galapagos

473
00:42:33,066 --> 00:42:37,600
are home to a rich community
of sea creatures.

474
00:42:37,600 --> 00:42:40,733
On the volcanic rocks
that hug the coastline,

475
00:42:40,733 --> 00:42:45,233
marine iguanas bask
in the morning sun.

476
00:42:49,300 --> 00:42:54,066
It's a time to socialize as they
warm up for the day ahead.

477
00:42:54,066 --> 00:42:59,133
Among the masses is
a visitor from outside --

478
00:42:59,133 --> 00:43:02,833
A spy adapted to both
land and sea.

479
00:43:02,833 --> 00:43:07,866
It needs both talents,
for iguanas feed on vegetation,

480
00:43:07,866 --> 00:43:10,700
and the land
has little to offer.

481
00:43:16,200 --> 00:43:20,133
Once they're up to temperature,
they take the plunge.

482
00:43:30,666 --> 00:43:34,400
Where they go,
our spy must follow.

483
00:43:43,733 --> 00:43:48,100
Iguanas are coldblooded,
so their time in the cold sea

484
00:43:48,100 --> 00:43:50,800
is limited to just half an hour.

485
00:43:53,533 --> 00:43:56,200
That includes
battling the surf.

486
00:44:04,300 --> 00:44:08,433
Spy Iguana swims
just like the real thing,

487
00:44:08,433 --> 00:44:11,166
propelled by
its articulated tail.

488
00:44:18,333 --> 00:44:22,233
When an iguana dives,
our spy dives too.

489
00:44:24,966 --> 00:44:29,366
The best feeding grounds
lie deep beneath the waves.

490
00:44:29,366 --> 00:44:33,433
Our spy will join them there.

491
00:44:33,433 --> 00:44:44,466
♪♪

492
00:44:44,466 --> 00:44:51,033
Unlike the barren land,
the sea is rich in nutrients.

493
00:44:51,033 --> 00:44:54,933
It nourishes the algae
the iguanas depend on.

494
00:44:54,933 --> 00:45:00,966
♪♪

495
00:45:00,966 --> 00:45:04,233
They eat almost nothing else.

496
00:45:04,233 --> 00:45:15,533
♪♪

497
00:45:15,533 --> 00:45:18,466
Each has a chosen spot
to graze.

498
00:45:22,900 --> 00:45:28,200
Spy Iguana hardly causes a stir.
There's no rivalry here.

499
00:45:31,933 --> 00:45:35,366
But the real iguanas
are on borrowed time.

500
00:45:37,500 --> 00:45:40,733
He must eat what he can
while he can.

501
00:45:40,733 --> 00:45:51,433
♪♪

502
00:45:51,433 --> 00:45:56,433
Leave too late, and he'll be
too cold to make it back.

503
00:45:56,433 --> 00:46:04,966
♪♪

504
00:46:04,966 --> 00:46:07,366
But he knows
when his time is up.

505
00:46:07,366 --> 00:46:20,200
♪♪

506
00:46:20,200 --> 00:46:23,966
He heads to the surface
and returns to land.

507
00:46:23,966 --> 00:46:32,166
♪♪

508
00:46:32,166 --> 00:46:36,233
Our spy has many
other inhabitants to meet.

509
00:46:40,833 --> 00:46:45,433
The most playful of all
are Galapagos sea lions.

510
00:46:48,566 --> 00:46:52,433
And who better to play with
than our spy creature?

511
00:47:09,666 --> 00:47:14,400
But playing games is not
in our spy's repertoire...

512
00:47:15,666 --> 00:47:18,400
...no matter the encouragement
it receives.

513
00:47:23,666 --> 00:47:28,466
The sea lion
seeks a more playful partner.

514
00:47:28,466 --> 00:47:33,533
But he leaves Spy Iguana
in the best possible spot,

515
00:47:33,533 --> 00:47:37,333
just in time to meet
a true wonder of the deep --

516
00:47:37,333 --> 00:47:42,100
Mola mola,
a type of sunfish.

517
00:47:42,100 --> 00:47:46,566
Its only means of propulsion
are its elongated fins.

518
00:47:46,566 --> 00:47:50,733
One of the largest bony fish
in the ocean,

519
00:47:50,733 --> 00:47:53,700
it reaches 10 feet in length.

520
00:47:57,533 --> 00:48:01,366
They visit
for one reason only --

521
00:48:01,366 --> 00:48:05,466
to be cleaned
by angelfish and hogfish.

522
00:48:07,733 --> 00:48:12,066
As our spies have found,
almost all undersea communities

523
00:48:12,066 --> 00:48:14,100
have their own
grooming specialists.

524
00:48:20,700 --> 00:48:24,933
Job done, they return
to the deep blue yonder.

525
00:48:24,933 --> 00:48:34,033
♪♪

526
00:48:34,033 --> 00:48:38,066
Our spy has one last inhabitant
to find.

527
00:48:42,033 --> 00:48:46,533
The shallows are home
to a colony of damselfish.

528
00:48:46,533 --> 00:48:57,900
♪♪

529
00:48:57,900 --> 00:49:01,600
They are suspicious
of outsiders.

530
00:49:01,600 --> 00:49:05,900
♪♪

531
00:49:05,900 --> 00:49:08,033
They're avid gardeners,

532
00:49:08,033 --> 00:49:11,400
so trespassers
aren't welcome here.

533
00:49:11,400 --> 00:49:17,800
♪♪

534
00:49:17,800 --> 00:49:21,800
They spend their time
tending their lawns of algae.

535
00:49:21,800 --> 00:49:26,333
Like an allotment,
it's divided into plots.

536
00:49:26,333 --> 00:49:31,633
To attract a mate, each male
has his own patch to care for.

537
00:49:34,533 --> 00:49:37,166
They must beware of intruders.

538
00:49:39,166 --> 00:49:43,700
A sea urchin, looking uncannily
like a naval mine.

539
00:49:47,233 --> 00:49:50,566
It creates its own kind
of devastation.

540
00:49:54,033 --> 00:49:58,233
It will graze their precious
algae down to the rock.

541
00:50:01,866 --> 00:50:04,600
To remove it they must
work together...

542
00:50:04,600 --> 00:50:09,033
♪♪

543
00:50:09,033 --> 00:50:12,033
...and use
a bit of extra oomph.

544
00:50:12,033 --> 00:50:22,433
♪♪

545
00:50:22,433 --> 00:50:27,000
It's now out of his patch
and onto his neighbor's.

546
00:50:29,233 --> 00:50:33,466
Each damselfish passes it along
to the next fish.

547
00:50:33,466 --> 00:50:48,233
♪♪

548
00:50:48,233 --> 00:50:51,500
They'll persevere
until it's finally gone.

549
00:50:51,500 --> 00:50:57,833
♪♪

550
00:50:57,833 --> 00:50:59,733
Nearly there.

551
00:51:01,100 --> 00:51:02,766
Done it!

552
00:51:02,766 --> 00:51:10,633
♪♪

553
00:51:10,633 --> 00:51:13,900
But our spies' adventures
aren't over.

554
00:51:15,800 --> 00:51:19,500
Spy Hammerhead has arrived
in the Galapagos,

555
00:51:19,500 --> 00:51:23,366
along with the hammerheads
last seen off Colombia.

556
00:51:25,866 --> 00:51:28,666
The sharks are completing
a round trip

557
00:51:28,666 --> 00:51:31,666
that began in the seas
around these islands.

558
00:51:34,566 --> 00:51:38,100
Hammerheads, like other
long-distance travelers,

559
00:51:38,100 --> 00:51:41,866
connect distant communities

560
00:51:41,866 --> 00:51:47,700
in a network of partnerships
that reach across the globe.

561
00:51:47,700 --> 00:51:52,300
As our spies have found,
ocean life is interconnected

562
00:51:52,300 --> 00:51:55,433
in ways
we could hardly imagine.

563
00:51:55,433 --> 00:52:00,566
♪♪

564
00:52:00,566 --> 00:52:06,333
It's an undersea world built
on extraordinary relationships.

565
00:52:09,066 --> 00:52:14,200
Next time, we discover some of
the trouble sea creatures face

566
00:52:14,200 --> 00:52:19,166
and what happens to spies
when things go horribly wrong.

567
00:52:19,166 --> 00:52:23,266
♪♪

568
00:52:25,766 --> 00:53:07,100
♪♪

569
00:53:07,100 --> 00:53:08,600
To learn more
about what you've seen

570
00:53:08,600 --> 00:53:10,266
on this "Nature" program,

571
00:53:10,266 --> 00:53:13,200
visit pbs.org.

572
00:53:13,200 --> 00:53:16,133
♪♪