- 6 days ago
Hidden deep underwater is the untold story of how the Nazis waged a secret war across the world’s oceans.
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00:00Hitler's darkest secrets and most terrifying weapons lost below the waves until now.
00:20Imagine if we could empty the oceans, letting the water drain away to reveal the secrets of the seafloor.
00:34Now we can.
00:38Using the latest underwater scanning technology, piercing the deep oceans and turning accurate data into 3D images.
00:49This time, was Australia's most prized warship destroyed by a Nazi secret weapon?
01:01What made this killer U-boat invisible?
01:07And how close did Hitler come to building an atomic bomb?
01:19Hitler's ambition was global.
01:37As the waters of Northern Europe drain away, they reveal evidence of the Nazis' most terrifying weapon of all.
01:46Norway. Lake Tyn.
01:51How did a secret operation here destroy a Nazi nuclear dream?
01:58At the bottom, there's this Nazi secret. No one can be sure about what's down there.
02:08During World War II, Nazi scientists begin the race to harness atomic power.
02:16Hitler's dream was to develop this bomb that could really devastate and destroy London.
02:28turning the war in the blink of a second, turning the war in the blink of a second. That was his dream.
02:39But the Nazis need a crucial ingredient to make an atomic bomb.
02:45It's called heavy water. Heavy water was a vital component of the attempt of the Germans to get their nuclear reactor to work.
02:57It's chemically hydrogen, but it's heavier. It's twice the weight.
03:02The world's largest producer of heavy water is near Lake Tyn in Norway.
03:13The Mork Power Plant. Once the world's largest hydroelectric power station.
03:22It's this energy that powers the creation of the precious heavy water.
03:27April 9th, 1940. Germany invades Norway.
03:40The Nazis were eager to get control of the heavy water at the Wehmark Plant.
03:46Due to the reason that they wanted to use it as a cooling aid in their nuclear reactor.
03:52In 1942, at the peak of the production here at Wehmark, they produced as much as 1,000 kilos of heavy water.
04:04Over a ton is a big step towards building Hitler's first nuclear reactor.
04:12It looked as if Germany might well get a nuclear bomb quickly.
04:16And the Allies were obviously very concerned about that.
04:19Churchill wanted the heavy water plant to be destroyed.
04:26The Wehmark Power Plant becomes a priority target for Allied air raids and sabotage.
04:34Damage like this eventually forces the Nazis to safeguard their stockpile of the precious commodity.
04:39February 20th, 1944.
04:48The Nazis plan to move almost a year's output of heavy water by train from the Mork.
04:54The carriages will cross Lake Tyn by ferry.
04:57From here, the cargo will travel to Germany, to the site of a nuclear reactor.
05:04Soldiers load around 40 barrels onto railway carriages.
05:11The Hydro ferry departs, but it never reaches its destination.
05:22At 10.45 in the morning, it sinks.
05:27The cargo tumbles into the water.
05:29Twenty-seven people are rescued.
05:33Twenty-six go down with the ferry.
05:36Mostly innocent civilians.
05:42For decades, the Hydro ferry and her secret wartime cargo lie hidden in the dark waters.
05:48Until now.
05:59Fredrik Soreda is a maritime archaeologist.
06:03He has studied this area for over 20 years.
06:09I'm standing on the shores of Lake Tyn.
06:12It's a very dramatic lake in Norway.
06:14It's got high mountains up to a thousand meters around it.
06:19And the lake is very deep, so it actually goes down to 460 meters.
06:27For decades, this lake had a big secret.
06:31And to be able to uncover that secret, the whole lake had to be explored.
06:39Fifteen hundred feet is too deep for divers.
06:42So Fredrik works with an expert in remotely operated vehicles.
06:49Thor Ulav Spera.
06:51So today we have the remotely operated vehicle.
06:55It is used to go down to the shipwreck so that we can film it.
07:01And also make a lot of other interesting documentation.
07:04They're equipping the ROV with the latest multi-beam sonar technology, allowing them to probe the darkest depths.
07:15Take it up and then we can load a new profile and then start doing the other tests.
07:19Yeah.
07:21Multi-beam sonar fires sound waves to the lake floor.
07:24The return signal displays the shape and depth of the features beneath.
07:32It becomes then a very detailed image.
07:34And that's what we're looking at.
07:36That's what we want.
07:37And Thor Ulav knows where to look.
07:41He's been fascinated by the story of the lost fairy for years.
07:46And he was one of the first to find the wreck.
07:48Now, he's back with powerful new scanning equipment and cameras that will finally give him the most detailed record of what's down there.
08:05Eventually, a ghostly shape blooms into view.
08:09The icy depths of the freshwater lake have preserved the decades-old secret.
08:28Oh, there we go.
08:29Coming in there.
08:30Oh, there it is.
08:31I see the rain.
08:34Where are we now?
08:35On starboard.
08:36Very nice.
08:43The superstructure is still standing there, and we can see a lot of things on board still.
08:54We only three and a half meters above it.
09:01Oh, look, that's a, is that a railway carriage?
09:04Yes, it is.
09:05Upside down.
09:06Upside down.
09:07It's upside down.
09:08It's been thrown over.
09:10Yeah, that's the wheels.
09:14The cargo on these carriages was once destined for Nazi Germany.
09:20Instead, it lies deep in the darkness of a Norwegian lake.
09:25But why is the ferry here?
09:33For the very first time, the waters of Lake Tin drain away to reveal the true picture.
09:42Using multi-beam sonar data combined with cutting-edge computer graphics, the lake's astonishing underwater landscape comes clearly into view.
09:52The first clue lies in the shape of the valley itself.
09:58The first clue lies in the shape of the valley itself.
10:03There are steep banks which descend 1,500 feet down to the bottom of one of the deepest lakes in Europe.
10:10As the waters of the lake drain fully away, the drowned ferry is brought back into the light of day for the first time in over 70 years.
10:22First, the stern of the 170-foot-long vessel, tilting downwards.
10:31Then, the wreckage of the railway carriages.
10:37And the captain's wheelhouse.
10:38The spread of the wreckage is firm evidence of a catastrophic, sudden sinking.
10:51Here we can clearly see the wreck, and we can see the wheelhouse up here.
11:00Yeah.
11:01And we can see there's something behind here.
11:04Now the bow is probably down in the mud.
11:07So, what wrecked the ferry?
11:09The answer is one of the most daring sabotage operations of World War II.
11:21Norwegian resistance fighters learn about the Nazi heavy water shipment.
11:26They are ordered by London to stop it at all costs.
11:30The night before the ferry departs, under cover of darkness, the saboteurs board the vessel and place a time bomb set to detonate at a precise moment.
11:48Then leave the ship to its fate.
11:53The saboteurs knew the stakes couldn't be higher.
11:56They had to stop the transportation to Germany.
12:15Draining Lake Tin reveals that the ferry is precisely targeted to sink in the deepest part of the lake.
12:22No Nazi diver can ever retrieve the barrels of heavy water from these depths.
12:29But is the ferry carrying enough heavy water to give Hitler an atomic bomb?
12:41Draining Lake Tin in Norway reveals an infamous Nazi nuclear secret strewn across the lake bed.
12:49Was there enough heavy water on board to make the Nazis' nuclear bomb program go critical?
12:56After the ferry went down, there was a lot of speculation that the heavy water on board the hydro had been replaced by normal water because it was so lightly guarded.
13:10So we wanted to go down and take up a barrel to prove that this was in fact the heavy water that was being shipped to Germany.
13:19The team has already examined three barrels from the depths.
13:24Testing samples taken from inside the barrels proves that they do contain heavy water.
13:37But was the ferry's cargo large enough to help Hitler build an atomic bomb?
13:43The only way to find out is to probe the darkness of Lake Tin and see how many barrels are left.
13:57Draining the waters of this Norwegian lake unlocks the answers.
14:04Amazingly, still intact after more than 70 years.
14:08First, one barrel on the deck, then two more spilled over the side.
14:19Then two others, 60 feet from the wreck site.
14:25That's five barrels visible around the wreck.
14:31Well, you can still see numbers on the barrels.
14:34Barrels, yeah.
14:37We believe that maybe 10 barrels floated because they were not full.
14:41And we have picked up three barrels.
14:44With at least 18 barrels accounted for, and using the scan data as a guide, the survey team can calculate where the others are.
14:54We believe that most of the other barrels are actually on board the ferry, still, underneath turned over carriages.
15:02That's about half a ton of heavy water.
15:06Enough to be a vital missing component for the Nazis' nuclear reactor.
15:12After the war, those involved in the German nuclear program said that the loss of the heavy water was absolutely decisive,
15:22and stopped their reactor program in its tracks.
15:24Nazi secret weapons are deployed across the globe, including the Indian Ocean.
15:43Draining the waters here, off the coast of Western Australia, reveals two shattered wrecks.
15:51What appears to be a German merchant ship, and HMAS Sydney.
16:01This mighty Australian warship disappears in November 1941.
16:08Will draining HMAS Sydney uncover the mystery of what happened in the national disaster?
16:16For the Australians, the loss of the Sydney almost became something like a national trauma.
16:25It was the pride of the Australian Navy.
16:28Not knowing about her final resting place, and the fate of her crew puzzled the Australians for decades.
16:38After the war, a German captain, Theodor Detmers, claims to have defeated the Sydney in battle.
16:48Few Australians trust the German captain's account.
16:52He had abandoned his ship, the Cormoran, which was reportedly nothing more than a cargo vessel.
17:01And there was no evidence of a battle.
17:05The only way to know for sure is to find both ships.
17:10The vessel Geosounder begins a remarkable search off the coast of Western Australia.
17:21Equipped with new scanning technology, and supported by the Australian government,
17:27the expedition is led by one of the world's top wreck hunters, David Mearns.
17:32The atmosphere was very tense, very pressured.
17:37I had to locate not just one ship, but two ships.
17:42The search area is huge.
17:45But amazingly, the captain of the Cormoran left an account containing vital clues to where his ship went down.
17:51Mearns homes in on an area 125 miles off the coast.
18:03Oh yes.
18:05Oh yes.
18:07This is exactly what you're looking for.
18:10After 12 days at sea, a sign.
18:13Here we go.
18:14Here's the rest.
18:16Here is the shadow. That's it.
18:18That's it.
18:20Just as Mearns hoped, by using the captain's account as a guide, he's found the Cormoran.
18:33Is he close to finding the Sydney too?
18:36Everything all up there.
18:38Here they are.
18:40Just four days later, the missing warship comes into view.
18:44It came up on the screen suddenly and we knew immediately that was the Sydney.
18:53It was just total elation that we had found it.
18:58We got it.
19:00That's it.
19:02That's HMS Sydney.
19:03At a depth of one and a half miles, it's too deep to dive.
19:13So an ROV explores the wreck site.
19:15Stop taking it.
19:16That's it.
19:18Run it.
19:19There's a gun.
19:20It's it.
19:22It's the what?
19:23Oh, stop.
19:24Stop right there.
19:25That's it.
19:26Wow.
19:27Oh, look at that.
19:28Okay.
19:29Among the ruins of a savage fight to the death are chilling reminders of this ship as a war grave for 645 men.
19:38But the underwater ROV camera only gives us glimpses of the sunken ships.
19:53Now, by combining the scan data with computer generated imagery, it's possible to drain the Indian Ocean.
20:02This is the HMAS Sydney, the pride of a nation, visible for the first time in over 70 years.
20:18The warship is pockmarked by battle damage, clear evidence of an epic close quarters firefight.
20:25Now, using evidence from the seabed, it's possible to reconstruct a remarkable struggle between the two lost ships and show a Nazi secret weapon in action.
20:41Draining the Indian Ocean reveals the lost Australian warship HMAS Sydney.
21:00But how did such a powerful vessel fall victim to an ordinary merchant ship?
21:05The Cormoran captain's account offers some clues.
21:12The 19th November was the birthday.
21:15It was November 19th, 1941.
21:18A beautiful day with warm sunshine.
21:21As so often in the Indian Ocean, the visibility was perfect.
21:28Suddenly, at 4pm, the two ships eye each other on the horizon.
21:3416 miles apart.
21:37The Cormoran signals that it's an innocent Dutch freighter.
21:42But as the Sydney moves in for a closer inspection, the Cormoran prepares to unleash its deadly secrets.
21:51The Nazi captain knows his only chance is to lure the warship into a close quarters fight.
21:58I let her come closer still.
21:59Slowly.
22:00Slowly.
22:01Slowly.
22:02Slowly.
22:03Slowly.
22:04Then, the Cormoran plays its trick.
22:05It appears to be an unarmed merchant vessel.
22:07But in reality, the Nazi ship is packed with the kind of deadly technology that Q might have created for James Bond.
22:16The Cormoran's mission in the Indian Ocean was to prey on Allied shipping.
22:19It was very much hit-and-run tactics.
22:23Unaware of the Cormoran's true identity, the Sydney moves in closer.
22:30The two ships were about 1,000 meters apart.
22:31Well, that's basically point-blank range.
22:33The enemy cruiser was now coming within the range that I considered suitable for the Cormoran.
22:34The enemy cruiser was now coming within the range that I considered suitable for the Cormoran.
22:36The Cormoran's mission in the Indian Ocean was to prey on Allied shipping.
22:37It was very much hit-and-run tactics.
22:40Unaware of the Cormoran's true identity, the Sydney moves in closer.
22:47The two ships were about 1,000 meters apart.
22:51Well, that's basically point-blank range.
22:56The enemy cruiser was now coming within the range that I considered suitable for my guns.
23:05I gave the order and tarn him the camouflage.
23:10The Dutch flag was hauled down and the German war flag ran up.
23:15According to the rules of war, concealed weapons are perfectly legal.
23:21But only if the ship reveals its true colors before firing.
23:26With the wreck of HMAS Sydney now drained of seawater,
23:34the first shocking evidence caused by Cormoran's hidden weapons can be seen in the clear light of day.
23:43The top of the captain's bridge, the command center of the ship, is missing.
23:49But why?
23:50On the Cormoran, hidden from view, a repurposed army anti-tank gun emerges.
24:01And fires, shattering the Australian captain's bridge.
24:06The command structure of Sydney would have been wiped out in the first opening shot of the battle.
24:15Rapid-fire anti-aircraft guns now rise up on hydraulic ramps, cutting down the Sydney's crew.
24:24On the Sydney's main forward gun turrets, the tops have been blown off.
24:35And there's a blast hole in the middle of one of the guns.
24:40What causes this?
24:41Despite its innocent appearance, the Cormoran carries very heavy weapons, perfect for close-range combat.
24:55At the push of a button, counter-weighted panels lift up to reveal these powerful guns.
25:04At virtually point-blank range, their overwhelming firepower knocks out Sydney's forward gun turrets.
25:14It's probable that those guns were taken out in the first 10 seconds, 15 seconds of the action.
25:20Although caught by surprise, the Sydney is still able to return fire and hits the Cormoran's engine room, setting it ablaze.
25:34The Nazi ship now prepares its sledgehammer blow.
25:40Underneath the water line lie two concealed torpedo tubes.
25:44And there are four more above the water, each hidden by a steel flap.
25:55It takes the Cormoran's crew just 32 seconds to prepare and fire a torpedo.
26:01They inflicted a great deal of damage very quickly on the Australian cruiser.
26:09Guns firing, the shells exploding. I mean, it's absolute mayhem, hell on earth.
26:15They were just being wiped out. It would have been absolute carnage.
26:216.25pm. Confident that the Sydney is fatally wounded and most of the crew already dead.
26:33The Nazi captain ceases fire.
26:38Victory.
26:39Never before in naval history had an armed merchant vessel defeated a cruiser. An open battle.
26:52Draining the water away from HMAS Sydney means crucial evidence of what caused its final death blow can now be seen.
27:00A 90-foot section of its hull is missing. The Cormoran's torpedoes caused critical damage and a huge explosion.
27:13The Sydney's entire bow breaks off, causing the whole ship to plunge one and a half miles down, with 645 men on board.
27:24The Sydney disappears entirely. There are no survivors.
27:32It's the most serious loss in the Australian Navy's history.
27:37Now we've found the wreck, we know what happened, and now we have an accurate idea of what happened to the ship.
27:45But if the Sydney was defeated, why is the German raider also at the bottom of the Indian Ocean?
27:52There's a clue in the original scans of the sea floor.
27:59Near the wreck is evidence of a debris field caused by a massive blast.
28:07What happened to sink the Cormoran?
28:11The Nazi ship sails away victorious, but it's been mortally wounded in the battle.
28:17With the Cormoran's engines broken down, a huge fire on board, and a number of mines in the hold, which were highly explosive.
28:29Commander Detmos had no choice whatsoever but to abandon ship.
28:34Hitler has similar merchant raiders, just like the Cormoran.
28:42To stop the ship's many secrets from being discovered, the crew then blow up their own vessel.
28:49Today, the two ships still lie, just 13 miles apart, on the seabed.
29:00The world's oceans hide Nazi secrets deep underwater.
29:13The Baltic Sea, draining the icy waters here, reveals a forgotten German aircraft carrier that never saw battle.
29:26Graf Zeppelin.
29:30It disappeared more than 70 years ago.
29:34Why is Hitler's only aircraft carrier lying heavily damaged at the bottom of the Baltic Sea?
29:42For decades, the ultimate fate of the Nazis' only aircraft carrier is a mystery.
29:55But then an oil survey vessel begins scanning the Baltic Sea.
30:00First of all, we came across something that piqued our interest.
30:09We found it using a multi-beam sonar.
30:12After post-processing, the first measurements indicate that it's about 260 meters long.
30:20It's the largest wreck ever found in the Baltic.
30:23Wow!
30:29It was a really big find.
30:32It was really spectacular.
30:34Now, diver and historian Stephen Burke is in the Baltic to investigate the monster of the deep, the Graf Zeppelin.
30:49When I first learned about the Graf Zeppelin, nothing was known as to what happened to it at the end of the war.
30:56What happened after that was a complete mystery.
30:59I made it my mission to go out and find what the fate of the ship had been.
31:03In the darkness, nearly 290 feet down, there are only glimpses of the lost giant.
31:16Timber decking on the flight deck.
31:20Massive chains from one of the anchors.
31:22At 850 feet long, could its massive size be the very reason why this mighty vessel never played a full part in the war?
31:37December, 1938.
31:44Kiel, Germany.
31:46Hitler loved launching large warships.
31:49He took great pleasure in it.
31:50He saw them as great national symbols.
31:53Hermann Goering, the head of the Luftwaffe, is master of ceremonies.
31:57The Nazis had huge ambitions for the vessel.
32:12More than 40 fighters, bombers and torpedo aircraft would have made it a mighty war machine.
32:18Elevators would carry aircraft from the lower deck up to the flight deck.
32:25Planes would launch by catapult.
32:31The thought of Stukas taking off from an aircraft carrier, carrying out torpedo and dive-bombing attacks on Allied ships.
32:39It would have greatly strengthened their naval position.
32:41Winston Churchill sees the Nazi aircraft carrier as a priority target.
32:51The British were very concerned that the Germans would complete the Grafzettler.
32:57There was a significant threat.
33:00But the Nazis are slow to finish this vast warship.
33:05Though launched and seaworthy,
33:09final work is delayed time and time again,
33:14because it needs huge amounts of construction material.
33:19Contrary to appearances, Germany was very short of resources.
33:23She was very short of steel.
33:25Because it was thought the war would be short,
33:29then it was thought that the Graf Zeppelin might not be complete in time to take part in the war.
33:35So they had to stop building large warships.
33:39The Nazis faced defeat.
33:40The Nazis faced defeat.
33:43In early 1945, Admiral Dönitz issued a scorched earth policy, which was that they were to destroy certain key assets to prevent them falling into Russian hands.
33:57And one of those assets was the Graf Zeppelin.
34:01The Graf Zeppelin is scuttled by a German wrecking crew, never to see battle.
34:06But that isn't the end of the story.
34:17It was abandoned on the river Oder.
34:20But now it rests 200 miles away in the middle of the Baltic.
34:24Why is the Graf Zeppelin here?
34:30After the war, the Russians seized the vessel as booty.
34:34The Russians raised it, so they sealed the holes, they pumped the water out and floated the ship.
34:46Then they decided to use the Graf Zeppelin for a unique Cold War experiment.
34:54Steven Burke visits the Polish Naval Academy in Gdynia to investigate.
35:00He's working with former Polish Naval officer Adam Olejnik.
35:08We have a picture, a lot of damage from different military materials.
35:15Steven's looking for clues to explain the ship's final moments.
35:20There's less damage.
35:21Less damage.
35:22Less damage on the port side.
35:23Yes.
35:24Okay.
35:25Adam is part of a Polish Navy team, which positively identified the Graf Zeppelin.
35:34The enormity of this vessel was a surprise.
35:39It's hard to imagine if you haven't seen it before.
35:43They used the mapping technology to scan the wreck.
35:46By using the detailed sonar scans.
35:54Now, for the first time in over 70 years, evidence of the Graf Zeppelin's final moments can be seen.
36:05Emptying the Baltic Sea of Water reveals an incredible sight.
36:09The 850-foot-long drowned Leviathan.
36:17The wreck clearly shows extensive damage caused by explosives.
36:23Including a large 100-foot hole in the deck.
36:30It looked like the result of Bowman.
36:33The hole wasn't there when the Germans abandoned the ship.
36:37So what caused it?
36:39In August 1947, the Russians want to see how much punishment the Graf Zeppelin could take before it sinks.
36:51So they planted a series of bombs inside the wreck.
36:542,000-kilo bombs that had detonated on the flight deck.
37:00They then sent in a series of waves of aircraft to attack the ship with bombs.
37:03Of over 90 drops, only five or six hit.
37:09The Soviets have no aircraft carrier of their own.
37:13So by bombing the Graf Zeppelin, they learned a lot about their potential new enemies.
37:19The British and the Americans.
37:24Sinking the Graf Zeppelin showed the Russians that aircraft carriers were not necessarily as easy to sink as they might have thought.
37:30They wanted to find out how you sank them.
37:35And they did.
37:36And they did.
37:40The Russians, in the fight, ring and ring.
37:47Nazi secret technology reached around the world.
37:53And draining the oceans reveals evidence of it in the most surprising places.
37:59The English Channel.
38:02The grave of a remarkable vessel equipped with a secret technology that could have changed the course of the war.
38:10Draining the oceans here reveals the mystery of the Nazi U-boat U-480.
38:16U-480, you could call it the first stealth submarine in history.
38:24This vessel vanished in 1945, carrying a lethal secret technology.
38:30What made this killer Nazi sub invisible?
38:34August 1944.
38:45The D-Day landings in France have put Nazi Germany in peril.
38:50In August 1944, the situation for the German U-boats in the British Channel was rather grim.
39:00Because it was one of the best defended areas around the British Isles.
39:09The Allies have a highly effective method for hunting the submarine raiders.
39:14Sonar.
39:17Earlier in the war, the Nazi U-boats savaged Allied shipping in the Battle of the Atlantic.
39:25Largely by hunting in packs on the surface.
39:31Where sonar is of limited use.
39:34But by 1944, heavy surface patrols forced the U-boats to operate completely underwater.
39:42Making them much more vulnerable to Allied sonar.
39:48This isn't Wolfpack warfare against convoys.
39:51It's individual submarines stalking individual ships.
39:57Operations in a submarine in the English Channel at that time were extremely dangerous.
40:03Your chances of survival if you're the commander of a U-boat are about 50-50.
40:08The Nazis want to counter the threat of sonar.
40:13The German answer to sonar detection was developing some kind of cloak of invisibility.
40:23By August 21, 1944, Hitler's designers have achieved their dream of stealth technology.
40:31U-boat captain Hans Joachim Furster and his crew lie in wait, deep in the English Channel.
40:39And the Allies never realise he's there.
40:42It's unprecedented.
40:47He gets into the English Channel and in five days, he sinks four ships.
40:53And he gets out.
40:55It's the most devastating patrol carried out into the Channel up to that time.
41:01It's quite remarkable.
41:03Will draining the waters of the English Channel help explain this Nazi secret?
41:13Underwater archaeologist Innes McCartney investigates reports of a U-boat wreck about 20 miles off the coast of southern England.
41:23Hidden 200 feet down.
41:25When you hit the water and you put your hand on the downline and you're swimming down to the wreck, the sense of anticipation is just truly incredible.
41:41Your first interaction with this completely unseen object is, can you work out what it is?
41:47Now, for the first time, the waters in the English Channel drain away and bring U-480 into the clear light of day.
42:05The secret of the stealth submarine is revealed.
42:09The entire surface of the U-boat is covered with rubber panels.
42:15Each panel has a series of tiny, regular holes.
42:22Instead of reflecting sonar signals back to an Allied warship, these rubber panels absorb them, making it effectively invisible.
42:36I put my hand on a black rubber panel.
42:39And I was like, I don't believe what I've just seen.
42:42Diminishing the effectiveness of the other side sonar could well make the difference between life and death.
42:52Today, in Kiel, Germany, one of U-480's sister boats still survives.
42:58U-480 wasn't a particular new design.
43:04It was the basic Type 7 U-boat only covered with this special cloaking device.
43:12But draining U-480 raises another critical question.
43:19If it was undetectable, why is U-480 at the bottom of the English Channel?
43:27Removing all the water means that clues to the damage done to U-480 can now be revealed.
43:34It has sustained a critical blow.
43:39The stern section is broken off.
43:42And there's a hole in the pressure hole.
43:45What caused such devastating damage?
43:50Faced with a modern high-tech threat, the Allies resort to a very old-fashioned response.
43:56Mines.
44:06The trap that U-480 fell victim to was a secret minefield.
44:13February 1945.
44:17Shipping lanes crisscross the channel.
44:20But all Allied vessels are secretly warned not to travel in a specific shipping lane area.
44:28And unknown to the U-boat crew, the British lay what's called a deep trap minefield.
44:35Far below the surface.
44:38Then wait.
44:40U-480 returned to what had been its old hunting ground, expecting to find some more targets.
44:45The navigational buoys were there, so it seemed as if the route was still being used.
44:50In fact, it wasn't.
44:53The British were laying minefields, and these came as a very nasty surprise.
45:00It was at the exact point they knew U-480 was going.
45:04Targeted killing based on intelligence.
45:07That's why you keep it secret.
45:12You're blind.
45:14Terrifying.
45:15Deviant x10
45:16almohad
45:23villages
45:25冒�
45:27嘆
45:290.002
45:30320 lbs of explosive bursts a hole in the submarine,
45:35320 pounds of explosive bursts a hole in the submarine,
45:42letting in tons of water per second.
45:46There is no chance of escape.
45:51The secret stealth technology was years ahead of its time.
45:57But in the end, even its special cloak of invisibility
46:01could not save Euphor Edo from the victorious Allies.
46:11The Nazis lost World War II.
46:16But the deadly secrets they left behind under the world's oceans
46:21are a reminder of the extraordinary courage
46:24of the men and women who brought the Nazis down.
46:31For more information on May President Sexton,
46:34just as family makers who threat to the роль
46:36from the dead of Michigan and the
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