1 00:00:07,508 --> 00:00:11,710 Narrator: The beaches and cliffs of normandy. 2 00:00:11,746 --> 00:00:18,534 In June 1944, the most important place on the planet. 3 00:00:18,569 --> 00:00:21,403 Dr delgado: It's the greatest battlefield in human history. 4 00:00:21,439 --> 00:00:25,941 Full of incredible stories. 5 00:00:25,976 --> 00:00:30,646 Narrator: But some of d-day's greatest stories remain untold, 6 00:00:30,681 --> 00:00:35,034 Because vital evidence is hidden beneath the waves. 7 00:00:36,704 --> 00:00:41,273 Imagine if we could empty the oceans. 8 00:00:41,308 --> 00:00:47,913 Letting the water drain away to reveal the secrets of the sea floor. 9 00:00:47,948 --> 00:00:50,666 Now we can. 10 00:00:50,701 --> 00:00:53,469 Using accurate data. 11 00:00:53,504 --> 00:00:57,172 And astonishing technology. 12 00:00:57,208 --> 00:01:01,910 To bring light once again to a lost world. 13 00:01:04,181 --> 00:01:11,136 What shocking weapon blew a key british warship into fragments? 14 00:01:11,172 --> 00:01:17,709 Can this shattered landing craft explain why omaha was the bloodiest beach of them all? 15 00:01:17,745 --> 00:01:20,946 Hendley: Unloading had to be stopd, because the living couldn't climb over the dead. 16 00:01:20,981 --> 00:01:26,835 Narrator: And why did the power of the sea mean life or death on utah beach? 17 00:01:26,871 --> 00:01:30,188 Dr delgado: The seas were still churned up and as the man next to you goes down, 18 00:01:30,207 --> 00:01:32,174 It's the luck of the draw. 19 00:01:50,744 --> 00:01:54,079 Narrator: After more than a year of meticulous planning, 20 00:01:54,115 --> 00:01:59,434 7,000 ships and a quarter of a million men are ready. 21 00:02:04,275 --> 00:02:10,179 The allied invasion of nazi occupied europe is about to begin. 22 00:02:10,214 --> 00:02:13,148 Nicholas: The scale of d-day is absolutely epic. 23 00:02:13,184 --> 00:02:16,902 It's the most extraordinary thing that's ever been undertaken in history. 24 00:02:19,306 --> 00:02:24,576 Narrator: For years, archaeologists have studied the battle on land. 25 00:02:29,083 --> 00:02:32,968 But now, they're looking somewhere else. 26 00:02:36,040 --> 00:02:41,176 Marine archaeologists working with the french underwater unit, drassm, 27 00:02:41,212 --> 00:02:47,199 Are scanning 50 miles of coast using the latest 3d technology 28 00:02:47,234 --> 00:02:50,335 Andy: This is the largest continuous underwater mapping 29 00:02:50,371 --> 00:02:54,072 Projects ever done for this particular area. 30 00:02:58,746 --> 00:03:02,748 Narrator: They've already discovered 300 military relics. 31 00:03:02,783 --> 00:03:06,268 Many unknown to historians. 32 00:03:06,303 --> 00:03:07,903 Archaeologist: That is really odd. 33 00:03:07,938 --> 00:03:11,106 It's really hard to tell what we're looking at. 34 00:03:11,141 --> 00:03:16,645 Narrator: Scanned in forensic detail, this deep-sea treasure trove is transforming 35 00:03:16,680 --> 00:03:19,114 Our understanding of the invasion. 36 00:03:19,149 --> 00:03:22,501 Nicholas: It's all still there in a way that actually it isn't on land. 37 00:03:22,536 --> 00:03:24,570 And we found some tremendously exciting things. 38 00:03:27,641 --> 00:03:34,780 Narrator: Now for the first time, we can use this data to unlock the secrets of d-day. 39 00:03:34,815 --> 00:03:38,634 By draining away the murky waters of the normandy coast, 40 00:03:38,669 --> 00:03:44,439 To reveal exactly what happened here. 41 00:03:44,475 --> 00:03:50,779 As the seas begin to empty, they uncover just some of the hundreds of wrecks. 42 00:03:50,814 --> 00:03:53,282 Each with a story to tell. 43 00:03:54,969 --> 00:03:59,438 Target number one, an allied destroyer. 44 00:03:59,473 --> 00:04:04,042 Sunk before the landings even begin. 45 00:04:04,078 --> 00:04:08,113 Her fate is one of d-day's greatest mysteries. 46 00:04:17,107 --> 00:04:22,044 1,200 allied warships approach the normandy coast. 47 00:04:30,671 --> 00:04:34,539 Catching the enemyrning, unprepared and off-guard. 48 00:04:34,575 --> 00:04:37,209 Prof grove: One can imagine the feelings of many of the germans. 49 00:04:37,244 --> 00:04:41,213 It must have been sheer terror to have seen this huge fleet. 50 00:04:47,271 --> 00:04:52,240 Narrator: Fire rains down on the five beaches the allies have marked for invasion, 51 00:04:52,276 --> 00:04:58,280 Utah, omaha, gold, juno, and sword. 52 00:04:59,350 --> 00:05:03,502 A norwegian destroyer called the svenner is on the eastern flank. 53 00:05:12,279 --> 00:05:17,966 A crew of 219 are preparing to join the bombardment of the beaches. 54 00:05:23,073 --> 00:05:24,272 When suddenly 55 00:05:26,310 --> 00:05:29,845 A massive explosion and she's gone. 56 00:05:33,867 --> 00:05:38,036 How is this svenner destroyed while surrounded 57 00:05:38,072 --> 00:05:42,040 By over a thousand heavily armed warships? 58 00:05:53,737 --> 00:05:58,340 Data from the survey contains tantalizing details. 59 00:05:58,375 --> 00:06:03,145 Combining them with the latest computer visualization techniques 60 00:06:03,180 --> 00:06:09,601 Means we can empty the normandy coast, and go looking for clues. 61 00:06:13,407 --> 00:06:16,375 As the water begins to drain away. 62 00:06:17,544 --> 00:06:20,846 A sight lost for 75 years. 63 00:06:22,049 --> 00:06:26,601 Hundreds of tonnes of twisted and ruined metal. 64 00:06:26,637 --> 00:06:33,008 Shocking evidence of a huge explosion. 65 00:06:33,043 --> 00:06:36,111 The bow and stern are in one piece. 66 00:06:39,983 --> 00:06:42,367 But the midsection is shattered. 67 00:06:47,307 --> 00:06:50,509 What could have caused so much damage? 68 00:06:59,837 --> 00:07:01,837 It can't be a shell. 69 00:07:01,889 --> 00:07:08,443 The svenner is beyond the range of german artillery. 70 00:07:08,479 --> 00:07:10,479 And it can't be a bomb. 71 00:07:10,514 --> 00:07:15,333 The allies completely dominate the air throughout d-day. 72 00:07:21,041 --> 00:07:27,045 But returning to the scan data, the survey team has a theory. 73 00:07:27,080 --> 00:07:30,665 Sauvage: You can see that the ship was violently broken into, 74 00:07:30,701 --> 00:07:34,503 Because two parts have sunk in two different orientations. 75 00:07:34,538 --> 00:07:38,206 So that really is the impact of a torpedo explosion. 76 00:07:41,044 --> 00:07:44,846 Narrator: If it was a torpedo, does that mean a hidden u-boat 77 00:07:44,882 --> 00:07:47,666 Managed to penetrate allied defenses? 78 00:07:52,372 --> 00:07:55,607 To find the answer, the team must dig deeper 79 00:07:55,642 --> 00:07:58,810 Into the secret history of d-day itself. 80 00:08:01,815 --> 00:08:04,900 Historian nick hewitt visits suffolk house, 81 00:08:04,935 --> 00:08:09,437 Headquarters of d-day commander, dwight eisenhower. 82 00:08:09,473 --> 00:08:11,907 Nicholas: This room was the nerve centre of a huge operation. 83 00:08:11,942 --> 00:08:15,577 It was planned all over the uk, all over the world, actually, 84 00:08:15,629 --> 00:08:17,779 And it was two years in the making, 85 00:08:17,814 --> 00:08:21,933 And this map is the very map used by eisenhower and his senior commanders 86 00:08:21,969 --> 00:08:24,803 To make it all happen. 87 00:08:24,838 --> 00:08:29,241 The key elements that could be controlled were when it was going to happen 88 00:08:29,276 --> 00:08:32,844 And precisely where it was going to happen. 89 00:08:32,880 --> 00:08:38,200 Narrator: But the only way this plan could work is if the germans never learn of it. 90 00:08:38,235 --> 00:08:42,671 To divert attention the allies leak fake plans. 91 00:08:42,706 --> 00:08:45,106 Prof grove: We had to keep the germans guessing, which we did, 92 00:08:45,142 --> 00:08:47,943 By an enormously successful deception plan, 93 00:08:47,978 --> 00:08:51,513 Which meant the germans didn't know, were we going to land in norway perhaps? 94 00:08:51,548 --> 00:08:53,815 Were we going to land just across the channel? 95 00:08:53,850 --> 00:08:57,936 That was a vital part of the operation. 96 00:08:57,971 --> 00:09:03,341 Narrator: Hitler's defense against invasion is the atlantic wall. 97 00:09:03,377 --> 00:09:09,714 A vast network of bunkers, pillboxes and artillery positions lining the coast 98 00:09:09,750 --> 00:09:12,267 From Spain to norway. 99 00:09:16,306 --> 00:09:22,477 He believes the allies will e coast of the english channel. 100 00:09:22,512 --> 00:09:26,615 And orders field marshall erwin rommel to stop them. 101 00:09:30,370 --> 00:09:33,371 Influenced by the allied deception plan, 102 00:09:37,978 --> 00:09:45,200 So concentrates his forces and heavy artillery at calais, cherbourg, and le havre.Port. 103 00:09:45,235 --> 00:09:50,572 So when the invasion fleet targets the beaches of normandy along the bay of the seine, 104 00:09:50,607 --> 00:09:55,277 The most powerful german defenses are in the wrong place. 105 00:09:59,516 --> 00:10:02,601 And there is not a single u-boat nearby. 106 00:10:11,011 --> 00:10:17,999 So if the svenner was blown apart by a torpedo, it can't have come from a u-boat. 107 00:10:18,035 --> 00:10:25,273 The survey team dig deeper and uncover another suspect. 108 00:10:25,309 --> 00:10:30,879 Nicholas: By June 1944, the german navy is almost finished as a fighting force, 109 00:10:30,914 --> 00:10:36,468 But they do have the number of small warships, operated by actually incredibly 110 00:10:36,503 --> 00:10:41,339 Well-trained and courageous crews. 111 00:10:41,375 --> 00:10:46,144 Narrator: Small warships like these, torpedo boats. 112 00:10:46,179 --> 00:10:48,380 They pack a real punch. 113 00:10:48,415 --> 00:10:52,267 With six torpedo tubes and two anti-aircraft guns, 114 00:10:52,302 --> 00:10:55,770 Maneuverable and sleek 115 00:10:55,806 --> 00:10:59,374 They can reach a top speed of 35 knots. 116 00:11:00,811 --> 00:11:03,111 Perfect for a hit and run. 117 00:11:07,501 --> 00:11:11,269 And there's a flotilla of them in le havre. 118 00:11:11,304 --> 00:11:14,506 Just 20 miles away from the d-day fleet. 119 00:11:18,512 --> 00:11:24,132 Now, using all their research, and details from the drained wreck of the warship, 120 00:11:24,167 --> 00:11:28,803 The team can reconstruct exactly what happened to the svenner. 121 00:11:35,412 --> 00:11:40,732 Just before dawn, the fifth torpedo boat flotilla is ordered to attack. 122 00:11:42,836 --> 00:11:48,623 A force of just four boats will challenge a thousand allied warships. 123 00:11:52,112 --> 00:11:56,381 Out of the blue, the t-boats approach the invasion fleet. 124 00:11:59,503 --> 00:12:03,104 The allies he laid a dense smoke screen. 125 00:12:03,140 --> 00:12:06,541 The t-boat crews use it to their advantage. 126 00:12:08,545 --> 00:12:12,447 They get close enough to fire 18 torpedoes. 127 00:12:14,301 --> 00:12:20,972 Each packed with 600 pounds of explosive, enough to cripple the biggest warship. 128 00:12:22,943 --> 00:12:27,278 But now, the smokescreen helps the allies. 129 00:12:27,314 --> 00:12:31,900 The t-boats are firing blind. 130 00:12:31,935 --> 00:12:35,703 17 torpedoes miss their mark. 131 00:12:37,674 --> 00:12:43,278 Leaving just one that runs straight into the svenner. 132 00:12:48,668 --> 00:12:55,540 186 crewmen swim to safety, but 33 go down with the ship. 133 00:13:05,068 --> 00:13:09,471 The haunting remains of the vessel stand as brutal testimony 134 00:13:09,506 --> 00:13:13,908 To the deadly power of a german t-1 torpedo. 135 00:13:17,080 --> 00:13:19,814 But the nazis are so unprepared, 136 00:13:19,850 --> 00:13:24,702 That this is their only success at sea throughout d-day. 137 00:13:26,406 --> 00:13:30,008 Prof grove: The fact that the germans are able to inflict only this single loss 138 00:13:30,043 --> 00:13:33,745 Demonstrates that the defenses that had been planned 139 00:13:33,780 --> 00:13:36,581 For the landings were very, very successful. 140 00:13:36,616 --> 00:13:41,503 It was now up to the army alone and the army would have a difficult job. 141 00:13:44,241 --> 00:13:47,809 Narrator: The battle for the beaches is about to begin. 142 00:13:47,844 --> 00:13:50,979 All of them packed with defenses. 143 00:13:51,014 --> 00:13:54,666 Pillboxes, barbed wire, machine gun posts. 144 00:13:57,704 --> 00:14:02,240 As the waters along the normandy coastline continue to recede, 145 00:14:02,275 --> 00:14:05,777 They reveal strange objects on the sea floor. 146 00:14:06,847 --> 00:14:13,501 What can they tell us of allied plans to confront the terrifying challenge ahead? 147 00:14:25,749 --> 00:14:29,333 The naval guns fall silent. 148 00:14:29,336 --> 00:14:35,840 More than 100,000 highly trained troops are ready to storm fortress europe. 149 00:14:37,978 --> 00:14:42,347 23,000 americans approach the most western of the beaches. 150 00:14:42,382 --> 00:14:45,767 Codename utah. 151 00:14:45,802 --> 00:14:49,203 But their plan immediately unravels. 152 00:14:49,239 --> 00:14:54,309 Strong currents push them more than a mile from their designated landing zone. 153 00:14:57,447 --> 00:15:02,700 And yet, for many, this turns into a stroke of luck. 154 00:15:02,736 --> 00:15:07,872 Led by brigadier general theodore roosevelt, son of the former president, 155 00:15:07,908 --> 00:15:14,512 They land in an area between two german strong points, an enemy blind spot. 156 00:15:18,735 --> 00:15:21,936 Dr delgado: When they come ashore, they realize they're in the wrong spot, 157 00:15:21,972 --> 00:15:26,441 But it turns out to be the right spot, because there's less germans there. 158 00:15:26,476 --> 00:15:29,544 And so theodore roosevelt jr in command, simply stops, 159 00:15:29,579 --> 00:15:32,847 Plants his flag and says, the war starts here. 160 00:15:38,872 --> 00:15:42,974 Narrator: Roosevelt's men outflank the german positions. 161 00:15:43,026 --> 00:15:48,379 And soon control the beach head. 162 00:15:48,415 --> 00:15:55,036 But a mile and half off shore, the survey team discovers something surprising. 163 00:15:56,706 --> 00:16:00,274 Strange shapes on the sea bed. 164 00:16:00,310 --> 00:16:06,014 It looks like some allied units never reached utah beach . 165 00:16:06,049 --> 00:16:08,900 Andy: Looks like three different vehicles of some sort, 166 00:16:08,935 --> 00:16:12,870 Like potentially an upside-down tank here. 167 00:16:12,906 --> 00:16:15,373 And then this vehicle's a bit more difficult to determine 168 00:16:15,408 --> 00:16:18,209 What it is and so we'll try to take a close look at that. 169 00:16:26,336 --> 00:16:28,086 Narrator: Divers go to investigate 170 00:16:34,611 --> 00:16:37,478 And find the wrecks heavily encrusted. 171 00:16:40,316 --> 00:16:43,434 They spot what could be tank tracks. 172 00:16:45,205 --> 00:16:46,804 And a gun barrel. 173 00:16:49,676 --> 00:16:53,211 But visibility is too poor to identify them. 174 00:16:54,247 --> 00:16:57,382 There is one way to see clearly. 175 00:16:59,836 --> 00:17:06,007 Combine visual clues with the teams 3d scan data and drain millions of gallons 176 00:17:06,042 --> 00:17:08,443 Of sea water away. 177 00:17:10,613 --> 00:17:17,268 As the waves recede, they gradually reveal a cluster of military vehicles. 178 00:17:20,040 --> 00:17:23,875 But the puzzle only deepens. 179 00:17:23,910 --> 00:17:29,147 They have gun barrels, and a turret set to one side. 180 00:17:34,571 --> 00:17:40,575 They've got tracks, heavy armor. 181 00:17:40,610 --> 00:17:43,177 They look like tanks. 182 00:17:44,547 --> 00:17:47,582 But this isn't a tank gun. 183 00:17:47,617 --> 00:17:52,136 It's more like the cannon of field artillery. 184 00:17:52,172 --> 00:17:54,605 So what are they? 185 00:18:01,681 --> 00:18:05,233 The team examines specialized allied weapons designed 186 00:18:05,268 --> 00:18:08,469 For the unique challenge of this terrain. 187 00:18:08,505 --> 00:18:12,140 And focus on close support artillery. 188 00:18:15,578 --> 00:18:22,366 In world war two, artillery is normally pulled by men, vehicles or horses, 189 00:18:22,402 --> 00:18:26,370 But in sand and water, this won't work. 190 00:18:26,406 --> 00:18:32,710 So, to support the infantry on the beaches the allies deploy these. 191 00:18:38,067 --> 00:18:40,935 M7 priest guns. 192 00:18:40,970 --> 00:18:43,938 Artillery that transports itself. 193 00:18:45,375 --> 00:18:51,813 105mm howizer mounted on the chassis of an m4 sherman tank. 194 00:18:53,783 --> 00:19:01,239 A tank fires in a flat trajectory, so the target must be in its line of sight, 195 00:19:01,274 --> 00:19:08,479 But a howitzer fires in an arc to lob shells up and over obstacles. 196 00:19:08,515 --> 00:19:12,366 Perfect for enemy positions high above the normandy beaches. 197 00:19:18,074 --> 00:19:24,312 More research reveals that the americans have 30 priest guns ready to land on utah beach, 198 00:19:24,347 --> 00:19:28,766 Carried on amphibious landing craft. 199 00:19:28,801 --> 00:19:32,970 Accounts from the day suggest only 27 make it to shore. 200 00:19:41,881 --> 00:19:47,401 Archaeologist, james delgado, thinks that these could be the missing three, 201 00:19:47,437 --> 00:19:52,039 But they're nowhere near their landing craft, which means whatever happened 202 00:19:52,075 --> 00:19:56,077 Was so violent, it threw the priest guns clear. 203 00:19:58,181 --> 00:20:02,733 What nazi weapon was powerful enough to do that? 204 00:20:02,769 --> 00:20:04,502 He has a theory. 205 00:20:06,339 --> 00:20:11,509 Dr delgado: This entire 50 mile long section of the coastline had been fortified. 206 00:20:11,544 --> 00:20:16,247 Rommel had anticipated scattering some 50 million mines, 207 00:20:16,282 --> 00:20:21,702 He was only able to deploy 20 million mines, but just the same, if you consider that, 208 00:20:21,738 --> 00:20:23,905 It just boggles the mind. 209 00:20:26,342 --> 00:20:30,912 Narrator: The night before d-day, around 300 allied minesweepers 210 00:20:30,947 --> 00:20:36,167 Carefully clear channels to each of the five landing zones. 211 00:20:36,202 --> 00:20:40,905 The invading fleet should have a clear run to the beaches. 212 00:20:40,940 --> 00:20:43,574 So what happened to the three priest guns? 213 00:20:48,248 --> 00:20:50,748 The survey team spots something else. 214 00:20:54,387 --> 00:20:59,440 Plotting the precise co-ordinates of the guns, places them well off course. 215 00:21:03,746 --> 00:21:07,348 Their landing craft has strayed out of the clear channels 216 00:21:07,383 --> 00:21:10,601 And drifted into an uncleared minefield. 217 00:21:14,274 --> 00:21:18,776 The same shifting currents that so helped roosevelt's infantry, 218 00:21:18,811 --> 00:21:20,811 Push it into deadly waters. 219 00:21:25,735 --> 00:21:28,202 The huge power of rommel's sea mines 220 00:21:34,177 --> 00:21:36,644 Explains why the priest guns were thrown 221 00:21:36,679 --> 00:21:38,646 Far from their landing craft. 222 00:21:42,935 --> 00:21:48,572 The bodies of the seven men crew may still be inside each of these vehicles. 223 00:21:48,608 --> 00:21:53,744 A haunting reminder of the human cost of d-day. 224 00:22:00,937 --> 00:22:05,573 At utah, this is one of the few allied set-backs. 225 00:22:05,608 --> 00:22:10,244 Roosevelt's men take the beach head with just 200 casualties, 226 00:22:10,279 --> 00:22:14,582 But 15 miles along the coast other young american soldiers 227 00:22:14,617 --> 00:22:21,205 Are struggling in the terrifying bloodbath of omaha beach. 228 00:22:21,240 --> 00:22:25,843 Ten times more men die here than at utah. 229 00:22:25,878 --> 00:22:27,378 But why? 230 00:22:31,084 --> 00:22:38,873 The survey team think they've found a clue amid a twisted mass of metal on the sea floor. 231 00:22:38,908 --> 00:22:43,811 As the once blood-stained waters of omaha beach drain away, 232 00:22:43,846 --> 00:22:47,281 Can this astonishing new discovery shed light 233 00:22:47,316 --> 00:22:50,601 On d-day's deadliest battlefield? 234 00:23:00,680 --> 00:23:09,904 After two hours of fighting on omaha beach the allied plan is falling apart. 235 00:23:09,939 --> 00:23:13,974 Troops are pinned to the shore. 236 00:23:14,010 --> 00:23:19,013 2,000 dead and injured soldiers litter these sands. 237 00:23:22,235 --> 00:23:26,203 It's the bloodiest engagement of d-day, but why? 238 00:23:34,480 --> 00:23:39,633 The survey team is eight miles off shore, looking for clues on the seabed. 239 00:23:42,672 --> 00:23:47,908 When their scanner picks up an unusual outline. 240 00:23:47,944 --> 00:23:50,277 Christopher: We do have a definite flat bottom boat 241 00:23:50,313 --> 00:23:53,681 With a substantial amount of damage in one corner 242 00:23:53,716 --> 00:23:56,467 And the front is missing entirely. 243 00:23:59,572 --> 00:24:02,840 Narrator: Divers take a closer look. 244 00:24:04,343 --> 00:24:10,181 Visibility is poor, just six or seven feet 245 00:24:10,216 --> 00:24:15,803 But, it's immediately clear that whatever it is, it's taken a hell of a beating. 246 00:24:17,006 --> 00:24:20,541 There are bullet holes everywhere and that's not all. 247 00:24:45,101 --> 00:24:52,940 Narrator: Mangled beyond recognition, the team has no idea what it is. 248 00:24:52,975 --> 00:24:56,977 But the multi-beam scanner has captured every detail. 249 00:24:58,314 --> 00:25:03,434 Using that data, we can drain away the waters of omaha beach, 250 00:25:03,469 --> 00:25:06,637 To reveal a twisted mass of metal. 251 00:25:12,111 --> 00:25:18,933 It's lying upside down, making it even harder to identify. 252 00:25:18,968 --> 00:25:24,471 But, by using the scan data, we can raise and rotate the wreck, 253 00:25:24,507 --> 00:25:30,044 Exposing the very topside for the first time in 75 years. 254 00:25:31,948 --> 00:25:35,966 Now, the team think they know what it is. 255 00:25:38,104 --> 00:25:43,741 An lci, landing craft infantry, one of the workhorses of d-day. 256 00:25:54,804 --> 00:25:58,072 They compare their data with u.S. Navy records 257 00:25:58,107 --> 00:26:00,407 And make a huge breakthrough. 258 00:26:02,111 --> 00:26:08,265 They believe it is lci 85. 259 00:26:08,301 --> 00:26:14,705 Can it help us understand just why omaha beach was d-day's bloodiest? 260 00:26:20,379 --> 00:26:23,847 It's clearly been at the heart of the battle. 261 00:26:23,883 --> 00:26:28,369 Its bow is blown clean off. 262 00:26:28,404 --> 00:26:36,043 It's covered in bullet holes and shrapnel damage from exploding shells. 263 00:26:36,078 --> 00:26:42,566 Ragged and twisted metal here suggests a devastating explosion. 264 00:26:42,602 --> 00:26:47,438 The damage on lci 85 reveals the power of german weapons 265 00:26:47,473 --> 00:26:51,008 Unleashed upon the americans as they tried to land. 266 00:26:55,281 --> 00:26:58,499 And there is other evidence too. 267 00:26:58,534 --> 00:27:05,639 The team unearth first hand accounts from men who served on lci85 that day, 268 00:27:05,675 --> 00:27:12,613 Including commanding officer coit hendley and lieutenant arthur farrar 269 00:27:12,648 --> 00:27:17,835 Now it's possible to convey what happened in terrifying detail. 270 00:27:24,377 --> 00:27:26,844 Allied troops have been landing for two hours. 271 00:27:31,117 --> 00:27:36,670 But omaha with its high cliffs is the most heavily defended of all the beaches, 272 00:27:36,706 --> 00:27:40,407 And the americans are pinned down under heavy fire. 273 00:27:42,244 --> 00:27:48,382 Lci 85 approaches the beach with much needed reinforcements. 274 00:27:48,417 --> 00:27:54,271 Lieutenant farrar must get the 188 troops on board quickly to shore. 275 00:27:56,909 --> 00:27:59,309 His problems start immediately 276 00:28:01,247 --> 00:28:03,280 Arthur: The path 50 yards wide was supposed to be cleared 277 00:28:03,315 --> 00:28:05,899 Through the underwater obstacles. 278 00:28:05,935 --> 00:28:10,037 We found it near to 10 yards wide and only partially cleared. 279 00:28:12,375 --> 00:28:15,376 Narrator: Blocked by an uncleared mine field, 280 00:28:15,411 --> 00:28:21,515 Lci 85 is pounded by shell after shell, fired from the cliffs. 281 00:28:27,106 --> 00:28:32,776 Under a hail of bullets, the commanding officer tries another route. 282 00:28:32,812 --> 00:28:36,180 Arthur: We then tried ramming through the obstacles about 283 00:28:36,215 --> 00:28:38,348 200 yards to the right of our assigned place. 284 00:28:41,704 --> 00:28:46,540 Narrator: But, as the lci grounds, it immediately hits a mine. 285 00:28:51,614 --> 00:28:55,632 It starts to sink, but is close enough to shore for 50 men 286 00:28:55,668 --> 00:28:57,868 To scramble towards the beach. 287 00:28:59,472 --> 00:29:05,309 Then another direct hit from a german shell smashes the landing ramps to pieces. 288 00:29:10,850 --> 00:29:14,201 Hendley: We could hear the scream of men through the voice tube, 289 00:29:14,236 --> 00:29:15,803 Unloading had to be stopped, 290 00:29:15,838 --> 00:29:19,640 Because the living could not climb over the dead. 291 00:29:19,675 --> 00:29:24,745 The deck was so slick with blood and cluttered with bits of flesh and dead, 292 00:29:24,780 --> 00:29:29,800 And mutilated men that it was difficult to move from one part of the ship to another. 293 00:29:31,704 --> 00:29:35,439 Narrator: And we don't only have the words of eye witnesses. 294 00:29:35,474 --> 00:29:40,944 Extraordinarily, the team discover color footage too. 295 00:29:40,980 --> 00:29:47,334 The courage and carnage on board lci 85 is captured by a combat camera team 296 00:29:47,369 --> 00:29:49,136 At the height of the battle. 297 00:29:50,706 --> 00:29:56,610 Here, filming the bodies of the dead, and the injured awaiting rescue. 298 00:29:58,581 --> 00:30:02,733 Shot in the leg, lieutenant farrar is one of the wounded. 299 00:30:02,768 --> 00:30:08,605 He watches as his remaining troops board another landing craft and attempt once more 300 00:30:08,641 --> 00:30:11,241 To reach their comrades on the beach. 301 00:30:13,078 --> 00:30:19,933 Astonishingly, 93 of them make it. 302 00:30:19,969 --> 00:30:23,604 But lci 85 is now barely afloat. 303 00:30:28,010 --> 00:30:32,846 Her crew take the decision to scuttle her, by setting off an explosive charge. 304 00:30:46,378 --> 00:30:52,933 The drained wreck of lci 85 is testimony to the horror of omaha beach. 305 00:30:54,036 --> 00:31:00,340 The allied bombardment has failed to take out any of over 40 enemy strong points, 306 00:31:00,376 --> 00:31:06,647 Leaving men who try to land here facing shell fire. 307 00:31:06,682 --> 00:31:10,634 Machine guns. 308 00:31:10,669 --> 00:31:13,036 And unswept mines. 309 00:31:16,075 --> 00:31:22,512 Finally, for those who do reach the beach, a new kind of hell awaits. 310 00:31:27,236 --> 00:31:30,904 Dr delgado: In this beach, men are being mowed down with erupting fire, 311 00:31:30,940 --> 00:31:35,075 With shrapnel flying everywhere. 312 00:31:35,110 --> 00:31:39,580 And men are hunkered down and they're waiting, as engineers try to advance to clear mines 313 00:31:39,615 --> 00:31:43,634 And to take out pillboxes, and it takes some time. 314 00:31:43,669 --> 00:31:46,203 And as that happens, the casualties mount, 315 00:31:46,238 --> 00:31:49,840 Making this the bloodiest beach on d-day. 316 00:31:54,213 --> 00:32:00,067 Narrator: Securing omaha costs over 2,400 american lives. 317 00:32:00,102 --> 00:32:03,103 It's the last of the five beaches to fall. 318 00:32:05,140 --> 00:32:08,575 But the allies cannot rest. 319 00:32:08,611 --> 00:32:12,045 The must now prepare for the inevitable counter attack. 320 00:32:13,148 --> 00:32:18,936 And that means landing thousands of tons of supplies every day. 321 00:32:18,971 --> 00:32:22,306 With no ports, it's a huge challenge. 322 00:32:27,046 --> 00:32:32,332 The survey team is to the east of omaha, near to juno beach. 323 00:32:32,368 --> 00:32:38,071 They detect a new wreck, it's huge and it's in pieces. 324 00:32:38,107 --> 00:32:43,477 What can this shattered warship reveal about a desperate nazi attempt 325 00:32:43,512 --> 00:32:46,713 To stop the allies in their tracks? 326 00:32:58,377 --> 00:33:01,778 D-day plus two. 327 00:33:01,814 --> 00:33:10,737 Over 4,000 allied troops have died to claim the five beaches, but 130,000 are now on shore. 328 00:33:10,773 --> 00:33:16,677 Another 700,000 are ready to land, along with vast quantities of vehicles, 329 00:33:16,712 --> 00:33:21,815 Fuel, ammunition and food. 330 00:33:21,850 --> 00:33:25,769 The battle to resupply the bridgehead has begun. 331 00:33:33,846 --> 00:33:39,066 These vital operations are coordinated from specially adapted warships. 332 00:33:43,072 --> 00:33:47,574 For juno beach, that ship is hms lawford. 333 00:33:51,613 --> 00:33:54,548 Equipped with powerful anti-aircraft guns, 334 00:33:54,583 --> 00:33:58,668 And state of the art submarine hunting technology, 335 00:33:58,704 --> 00:34:02,272 She's one of the most up-to-date ships in the royal navy. 336 00:34:03,442 --> 00:34:05,909 Prof grove: Considerable modifications made to the superstructure, 337 00:34:05,944 --> 00:34:10,013 She was given a large number of radars and communications equipment, 338 00:34:10,049 --> 00:34:12,415 And she was converted into a very significant command ship. 339 00:34:16,705 --> 00:34:22,709 Narrator: In the quiet of the morning, hms lawford is already hard at work. 340 00:34:22,745 --> 00:34:28,081 The allies have secured the coast, the enemy is nowhere in sight. 341 00:34:28,117 --> 00:34:30,967 When suddenly, there's a huge explosion. 342 00:34:38,210 --> 00:34:42,612 And a short time later, hms lawford is gone. 343 00:34:44,316 --> 00:34:46,233 The allies are dumb-struck. 344 00:34:58,080 --> 00:35:05,235 The mystery of the lawford makes her a priority for the survey team. 345 00:35:05,270 --> 00:35:10,140 When she's located, in 70 feet of water, 346 00:35:10,175 --> 00:35:14,010 Divers go in, 347 00:35:14,046 --> 00:35:15,645 Looking for clues. 348 00:35:17,883 --> 00:35:20,333 James delgado runs the dive from the bridge. 349 00:35:26,809 --> 00:35:28,775 Dr delgado: Dan, dan, this is topside. Do you read us? 350 00:35:35,634 --> 00:35:37,367 Dr delgado: And you're able to look inside? 351 00:35:43,142 --> 00:35:46,042 Narrator: The divers inch their way through the lawford's stern. 352 00:35:57,573 --> 00:36:01,441 Narrator: Exploring evidence untouched for 75 years. 353 00:36:17,576 --> 00:36:20,277 Narrator: They discover an unusual clue. 354 00:36:20,312 --> 00:36:26,900 A set of tubes, or narrow gun barrels, their purpose is another mystery. 355 00:36:28,303 --> 00:36:30,904 It's time to look more closely. 356 00:36:30,939 --> 00:36:35,909 Combining the dive team's findings with the latest multi-beam scan data, 357 00:36:35,944 --> 00:36:39,913 We can start to remove the waters off juno beach. 358 00:36:48,273 --> 00:36:52,008 As the bay of the seine slowly empties. 359 00:36:55,080 --> 00:36:57,881 It reveals a shocking crime scene. 360 00:37:03,705 --> 00:37:07,073 The lawford is in three pieces. 361 00:37:07,109 --> 00:37:13,346 The bow and the stern are over 300 feet apart. 362 00:37:13,382 --> 00:37:18,635 A sea mine is unlikely to cause this type of shattering damage. 363 00:37:20,272 --> 00:37:22,405 So what could have? 364 00:37:24,509 --> 00:37:32,332 At the bow, the set of tubes found by the divers is revealed to be a hedgehog. 365 00:37:32,367 --> 00:37:37,704 A weapon system that can fire 24 mortars at a time, over attacking u-boats. 366 00:37:50,769 --> 00:37:56,139 But the hedgehog is not loaded, it could be that the mortars were fired too late 367 00:37:56,174 --> 00:37:58,708 To avert a sneak torpedo attack. 368 00:38:00,379 --> 00:38:03,513 Or that is was never loaded in the first place. 369 00:38:04,883 --> 00:38:07,767 But a torpedo seems unlikely. 370 00:38:10,305 --> 00:38:15,408 The allies had blocked all u-boats from the area since d-day. 371 00:38:16,745 --> 00:38:21,081 And the damage on the wreck suggests something more powerful than even 372 00:38:21,116 --> 00:38:23,533 The biggest german torpedo 373 00:38:25,037 --> 00:38:29,973 It's the kind of damage expected from a thousand pound bomb. 374 00:38:30,008 --> 00:38:33,209 A deadly payload delivered by the luftwaffe. 375 00:38:39,868 --> 00:38:46,773 And yet, the allies still have complete air cover. 376 00:38:46,808 --> 00:38:50,276 Back at the stern, there's another clue. 377 00:38:50,312 --> 00:38:57,667 The boxes the dive team thought were batteries are actually full of unused ammunition. 378 00:38:57,703 --> 00:39:01,705 The lawford hasn't even fired her guns. 379 00:39:01,740 --> 00:39:05,542 So whatever got her was a total surprise. 380 00:39:06,545 --> 00:39:11,881 And was not spotted by the ship's advanced early warning systems. 381 00:39:16,338 --> 00:39:21,307 The team believe that leaves only one suspect. 382 00:39:21,343 --> 00:39:25,311 A hi-tech nazi wonder weapon. 383 00:39:25,347 --> 00:39:32,001 Developed in secret by german scientists for the past four years. 384 00:39:32,037 --> 00:39:36,806 A henschel hs 293 glide bomb. 385 00:39:36,842 --> 00:39:39,376 Nicholas: It's what in modern parlance is called a stand-off bomb. 386 00:39:39,411 --> 00:39:44,214 They basically enable german pilots to launch their weapon out of range of anti-aircraft 387 00:39:44,249 --> 00:39:47,000 Gun fire, away from marauding fighters, 388 00:39:47,035 --> 00:39:49,636 And they can launch these bombs and guide them 389 00:39:49,671 --> 00:39:52,005 Into place through radio control. 390 00:39:55,410 --> 00:40:00,613 Narrator: Operated by remote control, the hs293 guided missile 391 00:40:00,649 --> 00:40:03,133 Is almost impossible to stop. 392 00:40:04,302 --> 00:40:09,005 And accurate enough to home in on its target's weakest spot. 393 00:40:17,816 --> 00:40:19,833 (explosion) 394 00:40:38,904 --> 00:40:45,909 Aimed directly at the engine room, the 1,100 pound bomb 395 00:40:45,944 --> 00:40:51,047 Causes a massive internal explosion. 396 00:40:51,082 --> 00:40:54,100 Killing 37 men instantly. 397 00:40:55,437 --> 00:40:58,872 Hms lawford never stood a chance. 398 00:41:05,747 --> 00:41:10,800 With the mystery solved, it's clear that even in the days after d-day, 399 00:41:10,836 --> 00:41:15,405 The fight for the normandy coast is far from over. 400 00:41:15,440 --> 00:41:20,777 And even the most powerful allied warships remain at risk. 401 00:41:22,781 --> 00:41:24,681 Like this one. 402 00:41:24,716 --> 00:41:29,736 One of the titans of the allied invasion force, close to omaha beach. 403 00:41:31,873 --> 00:41:35,875 What sent this giant to the bottom of the sea? 404 00:41:50,942 --> 00:41:57,313 The normandy coast is under allied control. 405 00:41:57,349 --> 00:42:02,435 But driving hitler's armies out of europe will require millions of men 406 00:42:02,470 --> 00:42:05,238 And vast amounts of supplies. 407 00:42:08,677 --> 00:42:13,830 Delivered by these, lsts or landing ship tanks, 408 00:42:13,865 --> 00:42:16,432 The goliaths of the invasion force, 409 00:42:16,468 --> 00:42:20,436 Each capable of carrying more than 60 military vehicles. 410 00:42:24,309 --> 00:42:32,015 75 years later, the survey team is searching for evidence of that supply operation. 411 00:42:32,050 --> 00:42:38,004 Six miles off omaha, their scanner picks up the large wreck of an lst. 412 00:42:42,177 --> 00:42:49,632 Cross-referencing its location with navy records gives it a number, 496. 413 00:42:49,668 --> 00:42:53,503 Now, they want to find out what happened to it. 414 00:43:02,380 --> 00:43:10,136 Using the team's precise 3d data, we can drain away the water. 415 00:43:10,171 --> 00:43:14,407 To reveal the smashed remains of a d-day heavyweight. 416 00:43:18,046 --> 00:43:21,648 It's an astonishing scene. 417 00:43:21,683 --> 00:43:22,932 Packed with clues. 418 00:43:27,472 --> 00:43:29,072 The bow is obliterated. 419 00:43:33,178 --> 00:43:39,248 Scattered all around, the tanks and trucks it was carrying towards omaha beach. 420 00:43:46,541 --> 00:43:50,243 The whole sight is a catastrophic mass of twisted metal. 421 00:43:53,782 --> 00:43:56,299 The ship is lying upside down. 422 00:43:56,334 --> 00:43:59,502 A 40 foot hole ripped through the hull. 423 00:44:01,106 --> 00:44:06,743 Likely too large for a torpedo and too low for a glide bomb. 424 00:44:12,317 --> 00:44:15,134 Piecing together the evidence at the wreck site, 425 00:44:15,170 --> 00:44:18,137 Nick hewitt thinks he knows what happened, 426 00:44:18,173 --> 00:44:25,044 An encounter with an ingenious, but deadly weapon, called an oyster mine. 427 00:44:25,080 --> 00:44:28,681 Nicholas: So this is a sea mine that responds to changes 428 00:44:28,717 --> 00:44:32,435 In water pressure caused by passing ship and that is 429 00:44:32,470 --> 00:44:35,505 A weapon for which there is absolutely no antidote. 430 00:44:38,877 --> 00:44:42,412 Narrator: In a nighttime stealth attack, fast german vessels 431 00:44:42,447 --> 00:44:48,234 Called e-boats drop oyster mines in allied shipping lanes. 432 00:44:48,269 --> 00:44:54,774 Each one is packed with around 1,500 pounds of explosive. 433 00:44:54,809 --> 00:45:01,764 They are set to detonate, only when ships heavier than minesweepers pass overhead, 434 00:45:01,816 --> 00:45:04,467 Making them near impossible to detect. 435 00:45:09,107 --> 00:45:18,147 Lst 496, carrying over 60 tanks and trucks is heading straight into danger. 436 00:45:20,001 --> 00:45:25,071 As it approaches omaha beach, the downward pressure of the hull triggers a mine. 437 00:45:28,309 --> 00:45:32,945 A huge explosion blows a hole in midships on the port side. 438 00:45:35,483 --> 00:45:42,271 The power of the blast is so great, it detonates a second oyster mine. 439 00:45:43,308 --> 00:45:47,710 This time, the explosion rips right through her hull. 440 00:45:49,013 --> 00:45:51,013 In just 40 minutes, 441 00:45:51,049 --> 00:45:58,638 Lst496 sinks to the sea floor, taking her war fighting cargo with her. 442 00:46:01,242 --> 00:46:07,146 And more american soldiers and sailors join the list of those who sacrificed 443 00:46:07,182 --> 00:46:10,800 Their lives to liberate europe. 444 00:46:18,042 --> 00:46:21,344 Dr delgado: Here in the american cemetery overlooking omaha beach, 445 00:46:21,379 --> 00:46:25,615 In the midst of these graves of more than 9,000 men, 446 00:46:25,650 --> 00:46:30,203 75 years on, if the question were to be asked, 447 00:46:30,238 --> 00:46:32,605 Was this sacrifice worth it? 448 00:46:32,640 --> 00:46:35,842 The answer would still be a resounding yes. 449 00:46:35,877 --> 00:46:40,313 Because of what they did, the new world arose, 450 00:46:40,348 --> 00:46:44,534 Embodying the ideals for which these men fought and died. 451 00:46:44,569 --> 00:46:54,610 (music) 452 00:46:54,612 --> 00:47:21,671 (music) 453 00:47:21,706 --> 00:47:22,505 Captioned by subtitlepro llc