1
00:00:08,092 --> 00:00:09,635
BERTIE: We're looking for hammerheads,
2
00:00:10,470 --> 00:00:12,221
but we've had a surprise.
3
00:00:12,889 --> 00:00:14,348
-Can you see it, Hugh?
-Yeah.
4
00:00:16,267 --> 00:00:18,144
BERTIE: A tiger shark has turned up.
5
00:00:21,939 --> 00:00:23,691
(SUSPENSEFUL MUSIC PLAYING)
6
00:00:23,858 --> 00:00:25,026
Well, the first rule
7
00:00:26,110 --> 00:00:27,779
is to always look behind you.
8
00:00:29,530 --> 00:00:31,282
Whoa, whoa! Tiger, tiger.
9
00:00:35,203 --> 00:00:38,039
Whoa! That has really fired up the sharks.
10
00:00:38,873 --> 00:00:41,167
Now they are just blasting around.
11
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My adrenaline is just pumping.
12
00:00:45,922 --> 00:00:47,632
(MUSIC CONTINUES)
13
00:00:48,758 --> 00:00:49,842
(MUSIC ENDS)
14
00:00:55,014 --> 00:00:55,890
-(THEME MUSIC BEGINS)
-You ready?
15
00:00:56,140 --> 00:00:59,644
BERTIE:
I'm Bertie. Filming animals is my job.
16
00:00:59,769 --> 00:01:01,437
That is not a chase you see every day.
17
00:01:01,521 --> 00:01:04,023
BERTIE: And I take it really seriously!
18
00:01:04,148 --> 00:01:05,525
Look, I'm trying to film penguins.
19
00:01:05,733 --> 00:01:07,485
-(GROWLS)
-Oh, and I've missed it.
20
00:01:09,529 --> 00:01:10,988
Well, that was quite close.
21
00:01:12,073 --> 00:01:13,783
BERTIE: I want to tell wildlife stories
22
00:01:14,700 --> 00:01:16,369
in a rapidly changing world.
23
00:01:17,078 --> 00:01:19,205
That sounded like a big crack!
24
00:01:20,164 --> 00:01:20,998
(GASPS)
25
00:01:22,625 --> 00:01:24,585
BERTIE: These are my adventures.
26
00:01:26,045 --> 00:01:27,880
(THEME MUSIC ENDS)
27
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BERTIE: I'm traveling from my home
in England
28
00:01:32,301 --> 00:01:34,345
to a shark-filled paradise,
29
00:01:34,762 --> 00:01:36,556
off the coast of Costa Rica.
30
00:01:40,226 --> 00:01:44,480
And our next stop
is about 350 miles to the west.
31
00:01:45,189 --> 00:01:47,483
BERTIE: A tiny dot in the middle
of the Pacific:
32
00:01:48,359 --> 00:01:49,902
Cocos Island.
33
00:01:50,653 --> 00:01:53,072
I'm just a little bit excited
because it's a place
34
00:01:53,156 --> 00:01:55,908
that I've wanted to go
for a very, very long time.
35
00:01:56,075 --> 00:01:57,952
It's the sharkiest place on Earth.
36
00:01:59,370 --> 00:02:01,289
BERTIE: After 36 hours at sea,
37
00:02:01,664 --> 00:02:03,166
we've finally made it!
38
00:02:03,374 --> 00:02:04,750
(BIRDS SQUAWKING)
39
00:02:09,046 --> 00:02:11,174
BERTIE: Cocos is a shark magnet,
40
00:02:11,507 --> 00:02:13,885
attracting 14 different species.
41
00:02:14,719 --> 00:02:17,597
The best shark spectacle here
is the hammerhead.
42
00:02:17,847 --> 00:02:20,641
They gather here in mega schools.
43
00:02:21,184 --> 00:02:24,395
But with global shark and ray numbers
in freefall -
44
00:02:24,604 --> 00:02:27,690
70 percent have been wiped out
in just 50 years -
45
00:02:28,399 --> 00:02:32,403
Cocos is one of the last places left
to find them in such numbers.
46
00:02:33,821 --> 00:02:36,240
Sharks are in a race against time,
47
00:02:37,408 --> 00:02:38,451
and so am I.
48
00:02:39,952 --> 00:02:43,706
Because Cocos is a marine reserve,
I've got just 12 days
49
00:02:43,789 --> 00:02:48,461
to find a giant school of hammerheads
in some of the most dangerous waters
50
00:02:48,544 --> 00:02:50,338
for diving in the world.
51
00:02:50,963 --> 00:02:52,757
This is gonna be tough,
52
00:02:54,425 --> 00:02:55,843
but I love a challenge.
53
00:02:58,971 --> 00:03:00,014
Everyone ready?
54
00:03:00,348 --> 00:03:01,766
Okay. Here we go.
55
00:03:02,058 --> 00:03:04,018
Right, so whenever I go somewhere new,
56
00:03:04,143 --> 00:03:07,188
I like to chuck the drone up
to get a lay of the land.
57
00:03:09,565 --> 00:03:11,943
(DRAMATIC MUSIC PLAYING)
58
00:03:13,861 --> 00:03:16,113
(BIRDS SQUAWKING)
59
00:03:16,614 --> 00:03:18,199
BERTIE: Oh, that is amazing.
60
00:03:18,991 --> 00:03:21,744
(BIDS SQUAWKING)
61
00:03:22,078 --> 00:03:26,582
BERTIE: So Cocos is the tip
of a huge underwater volcano
62
00:03:26,749 --> 00:03:29,627
that erupted two million years ago.
63
00:03:31,837 --> 00:03:35,132
And those cliffs there,
they plummet into the dark waters,
64
00:03:35,216 --> 00:03:37,301
over two miles down...
65
00:03:39,887 --> 00:03:44,100
and when ferocious currents
smash into these rock walls,
66
00:03:44,267 --> 00:03:49,563
they force up food from the deep,
making Cocos irresistible to sharks...
67
00:03:53,192 --> 00:03:56,654
but a nightmare for divers.
68
00:03:59,031 --> 00:04:00,783
(MUSIC ENDS)
69
00:04:02,118 --> 00:04:04,829
BERTIE: Before I get underwater,
I need a plan.
70
00:04:10,793 --> 00:04:13,337
So this is our home
for the next couple of weeks:
71
00:04:15,131 --> 00:04:16,173
Sharkwater.
72
00:04:19,302 --> 00:04:23,848
She's a 130-foot specialist
shark research vessel
73
00:04:23,973 --> 00:04:27,560
that has all of our food, equipment,
and medical gear
74
00:04:27,643 --> 00:04:31,772
to keep our film crew, divers,
and scientists alive.
75
00:04:33,524 --> 00:04:36,944
We're a long way from home,
so she is our lifeline.
76
00:04:40,990 --> 00:04:44,493
To help me with the mission,
I've brought an epic team along.
77
00:04:45,536 --> 00:04:46,912
We're here to film sharks.
78
00:04:46,996 --> 00:04:49,999
BERTIE: Hugh's been making
underwater films for nearly thirty years.
79
00:04:50,374 --> 00:04:52,835
His job is to keep divers alive.
80
00:04:53,252 --> 00:04:55,629
Lost divers.
You know, people do get swept away.
81
00:04:55,755 --> 00:04:56,881
The currents here are furious.
82
00:04:57,006 --> 00:04:59,633
BERTIE: Cristiano's been
a legendary safety diver here
83
00:04:59,800 --> 00:05:01,260
for over two decades.
84
00:05:01,385 --> 00:05:02,845
Never dive by yourself.
85
00:05:02,970 --> 00:05:05,639
Once we're ready to go up,
we all go up together.
86
00:05:05,848 --> 00:05:06,891
We're on our own here.
87
00:05:07,058 --> 00:05:09,268
If there's an accident,
there's going to be big trouble.
88
00:05:10,728 --> 00:05:13,189
So what Hugh's saying is,
it's all bad news.
89
00:05:14,482 --> 00:05:16,025
No, we just need to be sensible!
90
00:05:16,359 --> 00:05:19,737
This is why we take grown-ups
on shoots because they look after us.
91
00:05:20,196 --> 00:05:21,822
(AIR WHOOSHES)
92
00:05:22,239 --> 00:05:24,116
BERTIE: We've also got
to make sure our equipment
93
00:05:24,283 --> 00:05:25,659
is in the best working order.
94
00:05:26,494 --> 00:05:30,456
Yeah, there is no room for any mistakes
in these sketchy waters.
95
00:05:31,791 --> 00:05:34,085
Now, we're starting with basic scuba.
96
00:05:34,627 --> 00:05:37,338
It's quick to set up
and I've got a special face mask,
97
00:05:37,671 --> 00:05:42,176
so unfortunately there is no escaping
seeing and hearing me at all times.
98
00:05:42,676 --> 00:05:43,552
Ready to go.
99
00:05:45,513 --> 00:05:49,350
BERTIE: Sharkwater is moored here,
in this sheltered bay.
100
00:05:51,936 --> 00:05:54,563
We're gonna travel to the tip
of a submerged mountain,
101
00:05:54,688 --> 00:05:56,524
about a mile from the mainland.
102
00:05:57,066 --> 00:05:57,983
Just here.
103
00:05:58,859 --> 00:06:00,986
I'm gonna call it Seamount.
104
00:06:01,654 --> 00:06:03,989
It's renowned as a hammerhead hotspot.
105
00:06:05,241 --> 00:06:07,535
Okay, let's see if we can find
some sharkies.
106
00:06:07,827 --> 00:06:10,246
(DRAMATIC MUSIC PLAYING)
107
00:06:24,718 --> 00:06:25,845
(MUSIC ENDS)
108
00:06:34,103 --> 00:06:38,065
You can see this current is just pumping.
I'm barely kicking.
109
00:06:38,858 --> 00:06:40,443
And we're just zooming along.
110
00:06:41,694 --> 00:06:44,530
This current's...
really got a hold of me.
111
00:06:45,114 --> 00:06:46,866
I'm only going in one direction.
112
00:06:47,783 --> 00:06:49,577
I am not swimming against this.
113
00:06:55,708 --> 00:07:00,463
Jagged rocks, spiky sea urchins.
It's an underwater minefield!
114
00:07:03,090 --> 00:07:05,468
And I am getting slammed around.
115
00:07:09,638 --> 00:07:13,225
If I hit this reef,
it is gonna shred my wetsuit.
116
00:07:13,934 --> 00:07:17,396
And I, uh... I don't wanna touch
the marine life, either.
117
00:07:20,316 --> 00:07:24,528
It's, uh... It's impossible to control
where I'm going...
118
00:07:25,821 --> 00:07:27,573
and what my camera's doing.
119
00:07:28,240 --> 00:07:31,118
If that gets smashed, I'm in big trouble.
120
00:07:32,578 --> 00:07:34,079
I could be swept away.
121
00:07:34,830 --> 00:07:37,374
Next stop: Philippines.
122
00:07:38,667 --> 00:07:41,086
BERTIE: If I come up
just 50 feet from the boat,
123
00:07:41,253 --> 00:07:43,214
the safety team will never spot me.
124
00:07:43,631 --> 00:07:44,590
I'll be gone.
125
00:07:45,341 --> 00:07:47,927
This has been a real eye-opener.
126
00:07:48,761 --> 00:07:50,679
I think we're going to need
a different approach.
127
00:07:55,976 --> 00:07:59,271
BERTIE: For our first dive,
those currents were impossible
128
00:07:59,522 --> 00:08:01,899
so we're leaving the Seamount
and going round
129
00:08:02,024 --> 00:08:03,484
to the other side of the island.
130
00:08:05,736 --> 00:08:09,573
Wow, those waterfalls are amazing.
131
00:08:10,157 --> 00:08:13,118
You can see why pirates
came all the way to Cocos
132
00:08:13,285 --> 00:08:14,995
to stock up on fresh water
133
00:08:16,121 --> 00:08:17,456
and hide their treasure.
134
00:08:20,251 --> 00:08:22,419
On this side of the island
there's a drop off.
135
00:08:23,629 --> 00:08:28,050
It's a cliff edge which plunges
nearly two miles down to the ocean floor.
136
00:08:28,884 --> 00:08:31,387
Here we could get better protection
from the currents.
137
00:08:38,394 --> 00:08:40,563
Well, it's way calmer here at the moment.
138
00:08:41,397 --> 00:08:43,774
But there's something
really odd happening.
139
00:08:45,776 --> 00:08:48,737
It looks like a weird desert heat haze.
140
00:08:49,321 --> 00:08:52,366
It's hard to believe
I'm in the same ocean.
141
00:08:53,117 --> 00:08:57,079
Well, I was just thinking
I can't focus the camera today,
142
00:08:57,413 --> 00:09:01,792
but I've just realized fortunately
it's not me, it's the thermocline.
143
00:09:03,168 --> 00:09:08,465
It's happening because ocean currents
are smashing into the deep sides
144
00:09:08,632 --> 00:09:09,592
of Cocos,
145
00:09:10,467 --> 00:09:13,012
forcing cold water up
from the deep
146
00:09:13,804 --> 00:09:19,685
where it hits warmer water,
creating this strange shimmering effect.
147
00:09:20,894 --> 00:09:23,272
It's the most extreme one
I've ever seen.
148
00:09:24,940 --> 00:09:27,735
And it might push the sharks up
from the deep.
149
00:09:29,403 --> 00:09:31,155
Oh, look, our first hammerhead!
150
00:09:32,323 --> 00:09:35,451
Whoa! Oh, my!
151
00:09:44,335 --> 00:09:46,378
That is just...
152
00:09:47,630 --> 00:09:49,256
madness.
153
00:09:53,385 --> 00:09:56,847
I've been obsessed with these guys
since I was a little kid.
154
00:09:58,557 --> 00:10:00,809
They are just so bizarre.
155
00:10:02,394 --> 00:10:05,105
They totally look like real-life aliens.
156
00:10:06,774 --> 00:10:09,151
And, man, does it look cool
filming the sharks
157
00:10:09,276 --> 00:10:11,445
through the thermocline,
through the haze.
158
00:10:16,075 --> 00:10:18,577
I can't get a really good look, though.
159
00:10:19,370 --> 00:10:21,080
It's just too distorted.
160
00:10:32,800 --> 00:10:35,469
Well, it looks like the thermocline
might be gone.
161
00:10:36,011 --> 00:10:39,640
But, the... the hammerheads
have done a disappearing act, too.
162
00:10:40,849 --> 00:10:42,351
They're just like ghosts.
163
00:10:45,354 --> 00:10:47,189
I mean, I guess at least it's given us
164
00:10:48,273 --> 00:10:51,360
a tantalizing little taste
of what we might see.
165
00:10:53,987 --> 00:10:55,948
So cool to be around them.
166
00:10:57,032 --> 00:11:00,160
And, yeah, oh, it's not scary.
It's just...
167
00:11:00,994 --> 00:11:02,371
awe-inspiring.
168
00:11:04,832 --> 00:11:06,750
We're going to have to keep looking.
169
00:11:09,211 --> 00:11:11,630
(BIRDS SQUAWKING)
170
00:11:12,840 --> 00:11:15,551
BERTIE: Two locations. Limited results.
171
00:11:15,968 --> 00:11:19,763
We still have time, but so far,
not a lot is working.
172
00:11:20,681 --> 00:11:23,976
So we're moving sites again
and carrying on the search.
173
00:11:27,229 --> 00:11:29,106
Well, even this drone isn't helping;
174
00:11:29,273 --> 00:11:32,067
the sharks are just too deep
to see from the surface.
175
00:11:34,862 --> 00:11:36,447
-(BLOWS RASPBERRY)
-BERTIE: And a tickly nose,
176
00:11:36,822 --> 00:11:38,198
not helpful either.
177
00:11:39,616 --> 00:11:41,452
Sometimes with both hands occupied...
178
00:11:41,618 --> 00:11:42,494
Thank you.
179
00:11:43,120 --> 00:11:45,038
BERTIE: ...you need
a little extra assistance.
180
00:11:45,539 --> 00:11:47,499
(CHUCKLES) I had a fly on my nose.
181
00:11:48,292 --> 00:11:50,878
(BIRDS SQUAWKING)
182
00:11:59,344 --> 00:12:01,263
Hang on, we might have something here.
183
00:12:03,015 --> 00:12:04,057
(WATER BLOWS)
184
00:12:04,725 --> 00:12:06,393
BERTIE: Just get a better position.
185
00:12:11,732 --> 00:12:13,108
That is a humpback whale.
186
00:12:14,985 --> 00:12:16,111
(CHUCKLES)
187
00:12:20,949 --> 00:12:23,160
There's a calf. There's a calf.
It's a mum and calf.
188
00:12:30,250 --> 00:12:32,377
Oh, it's so cute! It's tiny.
189
00:12:34,838 --> 00:12:36,757
There's dolphins on its bow.
190
00:12:41,178 --> 00:12:43,472
Female humpback whale
and a calf,
191
00:12:43,889 --> 00:12:45,474
dolphins on its nose.
192
00:12:49,603 --> 00:12:50,938
Oh, that is amazing.
193
00:12:54,441 --> 00:12:56,485
So easy to get distracted around here.
194
00:13:08,330 --> 00:13:09,456
BERTIE: It's Day 5,
195
00:13:09,832 --> 00:13:12,459
and we've been here
nearly half our time already.
196
00:13:13,043 --> 00:13:17,089
We've barely seen a hammerhead,
let alone huge numbers of them.
197
00:13:20,717 --> 00:13:23,846
There's another trick
to finding sharks here at Cocos.
198
00:13:28,642 --> 00:13:32,187
On every dive, I've kept my eye out
for a special little fish
199
00:13:32,479 --> 00:13:35,983
that can sometimes be a sign
that sharks are nearby.
200
00:13:36,775 --> 00:13:39,778
It cleans the sharks,
picking off their parasites
201
00:13:39,903 --> 00:13:41,154
to keep them healthy.
202
00:13:41,613 --> 00:13:45,117
Find these fish,
and we could find the sharks.
203
00:13:45,284 --> 00:13:48,370
Let's just check out
over this little ridge here.
204
00:13:52,666 --> 00:13:53,876
There they are!
205
00:13:56,587 --> 00:13:59,548
I can see these beautiful
little yellow barber fish.
206
00:14:00,716 --> 00:14:04,094
They set up above the reef
a cleaning station.
207
00:14:05,053 --> 00:14:07,598
The station's only a few feet in size,
208
00:14:08,098 --> 00:14:10,100
and all sorts of fish
are coming in
209
00:14:10,225 --> 00:14:11,810
to get their parasites removed.
210
00:14:13,312 --> 00:14:14,980
Look, there's a rainbow runner.
211
00:14:16,773 --> 00:14:19,610
I love how... how delicate
the barbers are!
212
00:14:20,485 --> 00:14:21,904
Hello, are you going to clean me?
213
00:14:24,197 --> 00:14:25,324
(CHUCKLES)
214
00:14:32,581 --> 00:14:33,498
Whoa!
215
00:14:35,667 --> 00:14:37,377
Check out these guys.
216
00:14:45,636 --> 00:14:47,638
These are Galapagos sharks.
217
00:14:48,221 --> 00:14:51,141
And they are chunky.
218
00:14:58,065 --> 00:15:01,234
Whoa! There's four or five... six, seven.
(CHUCKLES)
219
00:15:06,907 --> 00:15:07,824
Hey buddy!
220
00:15:10,619 --> 00:15:14,289
They are way more interested in me
than getting cleaned today.
221
00:15:16,041 --> 00:15:19,795
They're bold and they're curious,
just checking us out.
222
00:15:22,339 --> 00:15:23,882
They're just doing their thing.
223
00:15:26,218 --> 00:15:27,594
Awesome animals.
224
00:15:35,477 --> 00:15:36,603
Look, hammerhead!
225
00:15:42,150 --> 00:15:45,112
That hammer is so identifiable.
226
00:15:54,371 --> 00:15:58,500
It's incredible, finally,
to get a proper look through clear water.
227
00:16:03,005 --> 00:16:07,509
They're called the scalloped hammerhead.
The front of their hammer isn't flat.
228
00:16:07,634 --> 00:16:09,803
It's these rounded scallop shapes.
229
00:16:14,349 --> 00:16:18,645
That amazing hammer shape
helps spread out their senses.
230
00:16:21,690 --> 00:16:24,234
It moves their eyes
a little further apart,
231
00:16:24,359 --> 00:16:27,821
so they can see 360 degrees right round.
232
00:16:30,532 --> 00:16:34,536
These guys are just one
of ten hammerhead species worldwide.
233
00:16:39,249 --> 00:16:41,793
Let's just sit here and see
if they come any closer.
234
00:16:49,134 --> 00:16:51,720
They just keep turning away
right at the last minute.
235
00:16:54,556 --> 00:16:56,683
Hammerheads have got an extra sense,
236
00:16:57,142 --> 00:16:58,810
a real-life superpower,
237
00:16:59,561 --> 00:17:02,397
because they can sense electricity.
238
00:17:04,900 --> 00:17:10,322
All sharks can do this, but hammerheads
seem particularly sensitive...
239
00:17:11,031 --> 00:17:13,241
because just like their other senses,
240
00:17:13,492 --> 00:17:16,703
that wide head spreads
out the electroreceptors.
241
00:17:19,456 --> 00:17:24,377
Whenever we move a muscle,
we tense an arm, or our heart beats,
242
00:17:24,795 --> 00:17:27,547
it gives off an electric field
that they can detect.
243
00:17:29,007 --> 00:17:31,551
There's a hammerhead
down on the sand down there.
244
00:17:33,261 --> 00:17:36,681
And that's really good for them
for detecting prey in the dark.
245
00:17:37,015 --> 00:17:39,768
But it's tough for us
'cause getting close to them
246
00:17:39,851 --> 00:17:41,436
is gonna be a real challenge.
247
00:17:49,820 --> 00:17:51,154
Well, it seems like the hammers
248
00:17:51,279 --> 00:17:53,824
have moved away
from the cleaning station out there
249
00:17:54,116 --> 00:17:55,117
into the blue.
250
00:17:56,952 --> 00:17:58,829
Current seems doable...
251
00:18:05,585 --> 00:18:06,837
Whoa! There they are.
252
00:18:09,673 --> 00:18:12,092
That is just so cool!
253
00:18:19,015 --> 00:18:21,351
Whoa! (CHUCKLES)
254
00:18:22,102 --> 00:18:23,270
This is crazy.
255
00:18:25,814 --> 00:18:29,109
These guys are called bigeye jacks.
256
00:18:30,735 --> 00:18:34,531
And there's no prizes for guessing
why they're called bigeye jacks.
257
00:18:35,615 --> 00:18:38,869
That massive eye.
That's 'cause they're nocturnal feeders.
258
00:18:38,952 --> 00:18:41,538
They hunt by themselves at night
for little fish.
259
00:18:42,914 --> 00:18:46,209
They come together
in these schools in the day
260
00:18:46,293 --> 00:18:49,087
for protection
from their normal predators.
261
00:18:49,171 --> 00:18:53,175
The problem is it doesn't protect them
against humans,
262
00:18:53,383 --> 00:18:55,635
the most dangerous predator
on the planet.
263
00:19:00,473 --> 00:19:01,558
There are so many!
264
00:19:02,309 --> 00:19:04,519
Seeing this many of them together
265
00:19:05,687 --> 00:19:09,274
is like getting in a time machine
266
00:19:09,357 --> 00:19:12,736
and seeing what our oceans
used to be like.
267
00:19:15,822 --> 00:19:16,865
Here they come!
268
00:19:33,965 --> 00:19:39,012
You know, this is evidence
that protected areas work.
269
00:19:51,107 --> 00:19:52,400
Hammerhead!
270
00:19:58,615 --> 00:20:02,577
Every time a shark's been coming in,
the jacks are using its skin,
271
00:20:02,786 --> 00:20:04,537
its rough skin, as a scratching post.
272
00:20:06,790 --> 00:20:09,292
You know, I don't know why
the sharks don't just spin around
273
00:20:09,417 --> 00:20:11,670
and eat the jacks. They just run away.
274
00:20:13,630 --> 00:20:16,466
Those jacks have messed up
our plans this time,
275
00:20:16,549 --> 00:20:18,802
but the cleaning station's definitely
276
00:20:18,927 --> 00:20:20,220
a good place to hang out.
277
00:20:21,179 --> 00:20:24,015
I know that the hammerheads
are gonna turn up here eventually.
278
00:20:25,392 --> 00:20:27,352
Although they're so sensitive,
279
00:20:27,811 --> 00:20:29,729
I think we're just gonna have
to be patient.
280
00:20:34,025 --> 00:20:36,403
BERTIE: Over the next three days
we keep diving...
281
00:20:39,823 --> 00:20:41,574
but the hammers are like phantoms.
282
00:20:44,244 --> 00:20:46,371
And the moment
they're coming straight down the barrel
283
00:20:46,454 --> 00:20:48,373
and you think you've got them,
and you're like, "Yes!",
284
00:20:48,623 --> 00:20:50,959
they then turn and go away
and... "Ah, come on!"
285
00:20:53,753 --> 00:20:56,172
BERTIE: We just don't seem
to be able to crack it.
286
00:20:59,676 --> 00:21:01,136
And then on Day 9,
287
00:21:02,971 --> 00:21:06,266
something happens
that stops our mission in its tracks.
288
00:21:06,975 --> 00:21:10,937
Our producer James spots a shark
with a fearsome reputation,
289
00:21:13,440 --> 00:21:17,235
the type that killed someone right here,
just a few years ago.
290
00:21:19,070 --> 00:21:23,074
Time to get out, regroup,
and come up with a new safety plan.
291
00:21:26,786 --> 00:21:30,040
Well, we were just coming up
from a dive and all of a sudden,
292
00:21:30,498 --> 00:21:34,586
there were two very big tiger sharks,
and what was weird
293
00:21:34,711 --> 00:21:36,838
was that they were by
that island over there,
294
00:21:37,088 --> 00:21:40,675
and they were right at the surface,
right up against the cliff.
295
00:21:40,967 --> 00:21:44,679
So I'm just putting together the drone,
and I'm going to buzz it out there,
296
00:21:45,055 --> 00:21:46,681
see if we can figure out what's going on.
297
00:21:48,600 --> 00:21:52,354
Tiger sharks are the most deadly shark
at Cocos.
298
00:21:53,188 --> 00:21:57,275
And worldwide, only the great white
is more dangerous to humans.
299
00:21:58,777 --> 00:22:01,112
I want to work out what they're doing
so we can carry on
300
00:22:01,321 --> 00:22:03,823
diving safely in this area.
301
00:22:04,407 --> 00:22:06,993
Well, there is our tiger shark.
302
00:22:08,620 --> 00:22:11,039
It's just cruising in that channel
303
00:22:11,122 --> 00:22:15,543
between the little islet of Manuelita
and the main Cocos island.
304
00:22:16,419 --> 00:22:20,048
Its dorsal fin is breaking the surface.
Whoa, that is amazing.
305
00:22:20,382 --> 00:22:23,385
(DRAMATIC MUSIC PLAYING)
306
00:22:29,099 --> 00:22:30,600
BERTIE: If they're on the surface
like that,
307
00:22:30,767 --> 00:22:32,602
we can get underneath them safely
308
00:22:32,685 --> 00:22:34,145
and see what they're up to.
309
00:22:40,360 --> 00:22:42,570
It looks pretty ominous
and moody right now.
310
00:22:43,988 --> 00:22:47,075
I guess I'm a little nervous about getting
in the water with a tiger shark.
311
00:22:49,661 --> 00:22:53,164
(BIRDS SCREECHING)
312
00:22:54,958 --> 00:22:56,709
That's the noise of a little booby chick,
313
00:22:57,710 --> 00:23:00,046
getting fed. Sounds pretty happy about it.
314
00:23:03,591 --> 00:23:07,262
All over this cliff,
there's little white fluffy balls,
315
00:23:07,512 --> 00:23:08,721
little booby chicks.
316
00:23:09,264 --> 00:23:13,309
And you can see now the parents,
who've spent the day out at sea hunting,
317
00:23:13,685 --> 00:23:15,395
are now coming back to feed them.
318
00:23:16,062 --> 00:23:20,817
When they get the chance, tiger sharks
are known for eating seabirds.
319
00:23:21,317 --> 00:23:24,362
They'll even patrol below nest sites.
320
00:23:25,530 --> 00:23:27,532
Could this be what's happening here?
321
00:23:29,200 --> 00:23:31,828
BERTIE: My plan is to drop in near
the base of this cliff.
322
00:23:32,745 --> 00:23:35,665
I've positioned a sweep boat here
to pick us up
323
00:23:35,790 --> 00:23:37,375
in case the currents take us,
324
00:23:38,084 --> 00:23:40,336
and an emergency evacuation boat here
325
00:23:40,670 --> 00:23:42,630
if we get into trouble with the tigers.
326
00:23:49,345 --> 00:23:52,348
We need to get in quickly,
and get away from the surface
327
00:23:52,432 --> 00:23:54,517
where the tigers might mistake us
for food.
328
00:23:55,185 --> 00:23:56,603
Okay. Here we go. (GRUNTS)
329
00:24:04,402 --> 00:24:07,655
Surface to Bertie, surface to Bertie.
Comms check.
330
00:24:09,032 --> 00:24:11,784
BERTIE: Yeah, Zubin, I can hear you.
Can you hear me?
331
00:24:12,452 --> 00:24:14,579
Thanks, Bertie. I hear you loud and clear.
332
00:24:14,996 --> 00:24:16,998
Roger that. Chat to you in a bit.
333
00:24:23,838 --> 00:24:27,258
Well, the first rule of looking
for tiger sharks
334
00:24:28,468 --> 00:24:30,470
is to always look behind you.
335
00:24:31,679 --> 00:24:34,015
They love sneaking up behind things.
336
00:24:34,724 --> 00:24:38,102
So that's why I keep spinning round,
checking over my shoulder.
337
00:24:42,732 --> 00:24:43,942
Let's just hold here.
338
00:25:03,920 --> 00:25:07,048
Must say it's a bit spooky.
Whoa, whoa! Big... right here, right here.
339
00:25:07,382 --> 00:25:09,175
Tiger, tiger, tiger...
340
00:25:13,513 --> 00:25:16,599
Big ones can be 18 feet long.
341
00:25:18,059 --> 00:25:21,896
Pretty intimidating.
They are a big, powerful predator.
342
00:25:25,233 --> 00:25:26,859
You know, they can grow to...
343
00:25:27,819 --> 00:25:29,445
2,000 pounds.
344
00:25:30,780 --> 00:25:33,575
Oh, but they are just so big.
345
00:25:35,493 --> 00:25:36,578
Whoa!
346
00:25:39,080 --> 00:25:42,875
Look at those stripes.
That's how they get their name.
347
00:25:44,377 --> 00:25:48,047
There isn't a lot that isn't on the menu
of these tiger sharks.
348
00:25:48,590 --> 00:25:52,802
Fish, turtles, whale carcasses.
349
00:25:53,261 --> 00:25:58,600
They've even found license plates
inside the bellies of these tigers.
350
00:26:03,688 --> 00:26:04,772
Tiger, tiger!
351
00:26:14,282 --> 00:26:18,911
These sharks must just be waiting,
right at the base of the cliff
352
00:26:19,704 --> 00:26:21,664
for any birds, chicks or adults,
353
00:26:22,540 --> 00:26:25,084
to land on the surface and then boom.
354
00:26:25,752 --> 00:26:28,588
That's not a mistake
that the bird gets to make twice.
355
00:26:30,798 --> 00:26:33,426
These tigers are just so smart.
356
00:26:33,801 --> 00:26:38,222
That's the third one we've seen,
and they're all doing the same thing.
357
00:26:40,391 --> 00:26:41,726
There's two tigers just here.
358
00:26:43,478 --> 00:26:45,730
BERTIE: I can see how these tigers behave.
359
00:26:47,315 --> 00:26:49,108
Whenever we're in this channel,
360
00:26:50,276 --> 00:26:53,946
we know we've got to stay deep,
stay away from the surface,
361
00:26:55,490 --> 00:26:58,076
so no tiger mistakes us for a booby.
362
00:27:07,543 --> 00:27:11,297
Just as we saw on the drone,
the tiger sharks are patrolling
363
00:27:11,547 --> 00:27:14,717
right at the surface,
right in that surf zone.
364
00:27:15,510 --> 00:27:19,013
And I would not want
to be one of those boobies up there.
365
00:27:19,389 --> 00:27:21,641
(BIRDS SQUAWKING)
366
00:27:24,268 --> 00:27:26,437
BERTIE: We've learnt to think
like tiger sharks
367
00:27:26,521 --> 00:27:28,398
to keep us out of danger.
368
00:27:28,481 --> 00:27:32,652
And if we can think like hammerheads,
we could find a giant school.
369
00:27:33,528 --> 00:27:36,948
(BIRDS SQUAWKING)
370
00:27:40,410 --> 00:27:41,536
BERTIE: I'm meeting a man
371
00:27:41,619 --> 00:27:43,955
who's already learned
to think like a hammerhead
372
00:27:44,205 --> 00:27:45,540
so he can help save them.
373
00:27:47,375 --> 00:27:51,921
Cocos is a protected reserve,
but when they leave this safety zone,
374
00:27:52,130 --> 00:27:54,549
they're getting annihilated
by fishing boats.
375
00:27:56,134 --> 00:27:59,762
For 15 years, scientist Randall Arauz
has been tagging them
376
00:27:59,846 --> 00:28:01,764
to track their movements
across the Pacific.
377
00:28:02,849 --> 00:28:05,768
And where they go, he wants to protect.
378
00:28:06,728 --> 00:28:08,271
Randall, what's the plan?
379
00:28:08,646 --> 00:28:11,816
Well, the plan is to attach
one of these tags onto a shark.
380
00:28:12,066 --> 00:28:13,985
So, what... this is going to go
into the shark.
381
00:28:14,152 --> 00:28:15,570
And then, this detaches.
382
00:28:15,945 --> 00:28:18,156
So we're gonna see the shark
hopefully swimming away
383
00:28:18,281 --> 00:28:19,699
with the tag flopping behind.
384
00:28:19,949 --> 00:28:22,702
Do you have any particular tactics
for sneaking up on the sharks?
385
00:28:22,952 --> 00:28:25,329
So what you have to do is,
you look for the cleaning station.
386
00:28:25,413 --> 00:28:27,290
And remember these hammerheads
are very skittish.
387
00:28:27,457 --> 00:28:29,876
So any abrupt movement
and they'll get scared.
388
00:28:30,001 --> 00:28:32,086
So just wait for it to come in.
And once he's inside
389
00:28:32,253 --> 00:28:35,089
the cleaning station, getting cleaned,
that's when we take our shot.
390
00:28:42,638 --> 00:28:46,517
BERTIE: Randall and his team have tagged
nearly 200 hammerheads.
391
00:28:47,477 --> 00:28:51,314
He tracks them using a network
of receivers, like this one,
392
00:28:51,564 --> 00:28:54,484
dotted all over
the Eastern Tropical Pacific.
393
00:28:57,528 --> 00:29:01,449
I'm filming him as he tries to add
one more to his tally
394
00:29:05,328 --> 00:29:06,913
And there's no time to lose.
395
00:29:12,210 --> 00:29:14,670
Whoa! That shark's got a hook
in its mouth!
396
00:29:16,547 --> 00:29:21,010
That shows these sharks
are roaming outside the protected area,
397
00:29:21,636 --> 00:29:24,555
and that's when they come
into contact with this fishing gear.
398
00:29:26,599 --> 00:29:31,729
BERTIE: At Cocos in the last 20 years,
around half the population has vanished.
399
00:29:33,815 --> 00:29:37,693
Worldwide, scalloped hammerheads
are critically endangered.
400
00:29:39,195 --> 00:29:41,823
They are being fished out of existence.
401
00:29:46,661 --> 00:29:52,583
We kill more than 100 million sharks
every year to cut their fins off
402
00:29:53,376 --> 00:29:54,752
and put them into soup.
403
00:29:55,753 --> 00:30:00,716
And if we continue the way we're going,
shark species will go extinct.
404
00:30:04,262 --> 00:30:08,558
And these underwater ecosystems,
they need sharks to thrive.
405
00:30:09,141 --> 00:30:13,229
You know, the sharks, the top predators,
they keep this whole thing in balance.
406
00:30:28,160 --> 00:30:31,122
BERTIE: Seeing Randall at work,
I realize his mission
407
00:30:31,330 --> 00:30:33,708
could be the last chance
for these hammerheads.
408
00:30:41,549 --> 00:30:42,758
(BERTIE CHUCKLES)
409
00:30:43,426 --> 00:30:45,136
Absolute magic.
410
00:30:48,431 --> 00:30:52,435
BERTIE: Each tag is another step
to help save these incredible animals.
411
00:30:59,817 --> 00:31:04,530
It's vital that hammerhead highways
are made no-go zones for fishing boats.
412
00:31:09,660 --> 00:31:12,788
Oh, and I've got so excited,
I'm about to run out of air.
413
00:31:13,331 --> 00:31:15,041
So I'd better go up to the surface.
414
00:31:17,418 --> 00:31:20,588
BERTIE: Randall knows what it takes
to get close to hammerheads.
415
00:31:21,422 --> 00:31:24,967
I can see he's controlling his breathing
to keep his bubbles
416
00:31:25,051 --> 00:31:26,469
and noise to a minimum.
417
00:31:27,345 --> 00:31:29,764
And his movements are slow and steady.
418
00:31:31,474 --> 00:31:35,269
He's made himself almost invisible
so he doesn't spook
419
00:31:35,394 --> 00:31:37,229
these super-sensitive sharks.
420
00:31:39,815 --> 00:31:41,150
Yeah, you know,
the problem with...
421
00:31:42,318 --> 00:31:44,111
this scuba system is...
422
00:31:45,112 --> 00:31:49,659
we can be as still and hidden
in these rocks as we want, but...
423
00:31:51,285 --> 00:31:53,663
but still making so many bubbles,
so...
424
00:31:55,081 --> 00:31:57,083
I think we might need
a different plan.
425
00:32:04,173 --> 00:32:07,760
BERTIE: Until now, we've used scuba,
which is quick to get ready
426
00:32:07,969 --> 00:32:11,222
and pretty safe,
so is our "go-to" equipment.
427
00:32:12,723 --> 00:32:15,518
But we've also brought these: rebreathers.
428
00:32:17,103 --> 00:32:19,939
They take much longer to rig,
and, if you set them up wrong,
429
00:32:20,022 --> 00:32:21,482
can be really dangerous.
430
00:32:23,275 --> 00:32:26,112
The upside is they don't produce bubbles.
431
00:32:27,571 --> 00:32:29,865
So it looks like we're going to need
to switch to these
432
00:32:29,991 --> 00:32:32,034
if we want to get closer to these sharks.
433
00:32:37,873 --> 00:32:40,501
You can see how everyone's
gone very quiet this morning.
434
00:32:41,377 --> 00:32:43,045
And that's 'cause with normal scuba gear,
435
00:32:43,921 --> 00:32:46,298
if you mess up your equipment setup,
436
00:32:47,008 --> 00:32:49,844
the consequences aren't that bad,
whereas with rebreathers,
437
00:32:49,969 --> 00:32:53,514
they are serious.
So, we've got lots of checklists
438
00:32:54,056 --> 00:32:55,975
to make sure we're...
we're doing it right.
439
00:32:56,142 --> 00:32:58,602
But just got to take it
a little more seriously.
440
00:33:03,649 --> 00:33:06,402
(LAUGHTER)
441
00:33:07,236 --> 00:33:10,322
As I said, everyone's taking it
really seriously this morning.
442
00:33:15,453 --> 00:33:18,581
BERTIE: I think our best bet
is to head back to the cleaning station.
443
00:33:25,004 --> 00:33:26,255
-Oxygen analyzed.
-Yeah.
444
00:33:26,338 --> 00:33:28,632
BERTIE: Just a few final checks
to run through first.
445
00:33:28,758 --> 00:33:31,260
MALE VOICE: Computer, electronics.
Absorbent time remaining...
446
00:33:31,385 --> 00:33:32,261
SILVIO: Four hours.
447
00:33:45,566 --> 00:33:48,694
Those rocks down there
look like a pretty good place to hide,
448
00:33:49,779 --> 00:33:51,781
so I'm gonna get down in
amongst the rocks,
449
00:33:52,239 --> 00:33:55,451
chill out, and see if we can get
the hammerheads to come to us.
450
00:34:03,000 --> 00:34:06,629
Your normal scuba diving equipment,
you just don't get the time down here.
451
00:34:06,712 --> 00:34:08,506
You're just getting a little snapshot.
452
00:34:13,385 --> 00:34:15,262
You know, these things are tricky
to set up,
453
00:34:15,346 --> 00:34:17,348
but they're just so good for filming.
454
00:34:18,057 --> 00:34:19,892
I can sit still down here for hours...
455
00:34:20,392 --> 00:34:21,435
in stealth mode!
456
00:34:26,232 --> 00:34:29,068
Everywhere I look,
there's little dramas unfolding.
457
00:34:29,401 --> 00:34:32,154
There's a little damselfish
that has hilarious little lips.
458
00:34:32,279 --> 00:34:36,408
It looks like it's got lipstick on,
and it's just pecking away at the algae.
459
00:34:36,867 --> 00:34:39,787
(ETHEREAL MUSIC PLAYING)
460
00:34:52,258 --> 00:34:53,843
Okay, I think we could be in business.
461
00:34:54,385 --> 00:34:57,763
(MUSIC CONTINUES)
462
00:35:12,027 --> 00:35:14,738
BERTIE: It's time to be really,
really quiet. It's coming this way.
463
00:35:15,656 --> 00:35:18,284
(MUSIC CONTINUES)
464
00:35:38,888 --> 00:35:41,557
Whoa! That was crazy!
465
00:35:41,932 --> 00:35:44,602
These rebreathers
are an absolute game changer.
466
00:35:53,402 --> 00:35:55,654
BERTIE: Now I'm keeping still,
with no bubbles...
467
00:35:56,155 --> 00:35:58,490
the two things
that have given me away before
468
00:35:59,116 --> 00:36:00,993
So we're nearly invisible to them.
469
00:36:01,535 --> 00:36:05,998
For the first time, I'm close enough
to see how they move, how they behave.
470
00:36:12,755 --> 00:36:16,175
It slowed right down,
and they just roll on their side,
471
00:36:16,342 --> 00:36:17,468
opening up their bellies.
472
00:36:17,635 --> 00:36:20,512
It's almost like a dog asking
for a little scratch.
473
00:36:22,014 --> 00:36:25,017
And then all the little barber fish
come rushing out the reef,
474
00:36:25,184 --> 00:36:26,685
and they just start nibbling.
475
00:36:47,665 --> 00:36:49,833
(MUSIC ENDS)
476
00:36:50,876 --> 00:36:54,672
You see that female had a big scar
just above its pectoral fin.
477
00:36:54,922 --> 00:36:56,006
Well, that's from mating.
478
00:36:57,132 --> 00:36:59,009
The males will come along,
and when they're mating
479
00:36:59,093 --> 00:37:00,928
they'll bite their pectoral fin.
480
00:37:02,846 --> 00:37:04,265
And this is a great sign.
481
00:37:04,807 --> 00:37:07,434
It's thought that hammerheads
come together in these schools
482
00:37:07,518 --> 00:37:08,560
to find a mate.
483
00:37:09,561 --> 00:37:12,815
Those scars right there
are a clue that huge gatherings
484
00:37:12,940 --> 00:37:14,149
are probably here.
485
00:37:14,692 --> 00:37:16,151
I just haven't seen them yet.
486
00:37:21,532 --> 00:37:23,492
They're out there in the gloom somewhere.
487
00:37:25,744 --> 00:37:28,664
And we've only got one more day
of diving to nail this.
488
00:37:29,873 --> 00:37:34,128
(DRAMATIC MUSIC PLAYING)
489
00:37:47,182 --> 00:37:48,642
Got to be able to see the sharks.
490
00:37:52,396 --> 00:37:54,273
BERTIE: It's our final day at Cocos.
491
00:37:56,400 --> 00:38:00,487
Our last chance to try and see
if these giant schools still exist.
492
00:38:07,119 --> 00:38:08,495
(MUSIC ENDS)
493
00:38:15,252 --> 00:38:18,213
BERTIE: But as usual,
Cocos is not gonna make it easy.
494
00:38:19,590 --> 00:38:21,425
Whoa, look up there!
495
00:38:24,845 --> 00:38:28,640
There's a huge school
of skipjack tuna just ripping overhead.
496
00:38:29,475 --> 00:38:32,519
It's like watching a big flock of birds
blasting over.
497
00:38:33,896 --> 00:38:36,690
And that has really fired up the sharks.
498
00:38:37,024 --> 00:38:40,110
(TENSE MUSIC PLAYING)
499
00:38:42,946 --> 00:38:47,284
They were just gliding around before,
but now they are just blasting around.
500
00:38:49,328 --> 00:38:51,997
My adrenaline is just pumping!
501
00:38:54,666 --> 00:38:56,627
I wonder if they're putting
the hammerheads off.
502
00:39:01,006 --> 00:39:02,174
(MUSIC ENDS)
503
00:39:02,299 --> 00:39:04,218
Come on. Patience.
504
00:39:06,887 --> 00:39:08,722
Just let it all calm down.
505
00:39:12,559 --> 00:39:16,188
(ETHEREAL MUSIC PLAYING)
506
00:39:18,440 --> 00:39:19,983
Oh my...
507
00:39:22,694 --> 00:39:25,489
That is just so epic!
508
00:39:31,412 --> 00:39:35,207
There's too many to count,
and they're just swirling 'round.
509
00:39:38,001 --> 00:39:41,004
These giant schools do still exist.
510
00:39:43,507 --> 00:39:46,427
This is what makes Cocos Island special.
511
00:39:46,760 --> 00:39:49,430
There are not many places left
on the planet
512
00:39:49,513 --> 00:39:52,266
where you can see this number
of sharks together.
513
00:39:54,101 --> 00:39:58,063
But I wanna get in amongst
that school to see what's going on.
514
00:39:58,564 --> 00:40:01,650
(MUSIC CONTINUES)
515
00:40:03,318 --> 00:40:05,195
The current's starting to build now.
516
00:40:10,200 --> 00:40:11,452
Right. Here we go.
517
00:40:12,411 --> 00:40:15,831
To infinity and beyond!
518
00:40:16,623 --> 00:40:20,127
(MUSIC CONTINUES)
519
00:40:39,980 --> 00:40:41,482
They're letting me in amongst them!
520
00:40:42,858 --> 00:40:47,237
And now I can see it's just a big,
swirling dancefloor.
521
00:40:52,117 --> 00:40:55,996
On the outside, you can see males,
the smaller males, darting in,
522
00:40:56,288 --> 00:40:59,208
trying to entice the big females
away to mate.
523
00:41:01,919 --> 00:41:05,005
This right here is the start
of the next generation.
524
00:41:09,635 --> 00:41:12,930
I've imagined this view
in my head for years,
525
00:41:13,680 --> 00:41:17,976
but I did not think we'd actually get
to see it in real life.
526
00:41:20,687 --> 00:41:23,357
BERTIE: It's the completion
of a lifelong ambition.
527
00:41:26,860 --> 00:41:29,863
But if we don't stop fishing them
and protect them
528
00:41:29,988 --> 00:41:32,324
once they leave the safe waters of Cocos,
529
00:41:33,075 --> 00:41:35,702
these ghosts of the ocean
will disappear...
530
00:41:37,412 --> 00:41:38,288
forever.
531
00:41:43,168 --> 00:41:44,670
(MUSIC ENDS)
532
00:41:46,713 --> 00:41:47,714
(THEME MUSIC PLAYING)
533
00:41:47,839 --> 00:41:50,133
BERTIE: We know
where sharks migrate near Cocos,
534
00:41:50,676 --> 00:41:52,052
and we know they're targeted
535
00:41:52,177 --> 00:41:55,305
by fishing fleets when they leave
protected zones.
536
00:41:56,890 --> 00:42:00,352
Good news is that those zones
are about to get bigger,
537
00:42:00,936 --> 00:42:04,648
but it might come too late
for the shark Randall tagged in this film.
538
00:42:04,856 --> 00:42:08,443
Since October 2020,
the shark moved around Cocos,
539
00:42:08,527 --> 00:42:11,029
but in December, the signal went dead.
540
00:42:13,282 --> 00:42:14,616
(THEME MUSIC ENDS)