- 6/4/2025
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00:00Hitler's Berlin, the heart of Nazi Germany.
00:05Beneath its concrete and steel lies a clandestine world
00:09designed under the watchful eye of the Fuhrer himself,
00:12a vast complex of bunkers, shelters, and tunnels
00:16built to protect his people and defend his crown jewel
00:21as he sought world domination.
00:25But when the Nazis' fate is sealed in 1945,
00:29so is their subterranean realm.
00:32Workmen discover underground passages
00:34leading to air raid shelters
00:35once used by members of Hitler's government.
00:38Now, more than 60 years later,
00:41a team of archaeologists is setting out
00:43to reveal Berlin's dark past
00:46and unlock Hitler's secret city.
00:59The mission begins in a park in the suburbs of northern Berlin.
01:08Here, a bizarre concrete fort juts out of a hillside surrounded by trees.
01:16A founding member of this group of explorers, Dietmar Arnold,
01:21remembers venturing in as a teenager.
01:23In this time, this was, what you can say,
01:26like a place for playing only for child, you know?
01:29This was like an adventure when we come here in.
01:31This was absolutely fantastic,
01:33but I never believed in this time
01:35that one day we will explore this
01:37and we will open this for the public.
01:40Three decades later, the Berliner Underworld Association,
01:53a team of archaeologists, historians and archivists,
01:57have spent 10,000 hours researching, clearing and recording the bunkers.
02:02And they keep finding new secrets
02:05as they dig ever deeper into the foundations.
02:08August 1940, British bombers retaliate for the German bombing of London,
02:20hitting Berlin at night in a surprise attack.
02:28Hitler is furious.
02:31He orders the immediate construction of three colossal flak towers
02:35in a triangle around the city center.
02:41Bristling with anti-aircraft weapons,
02:43Hitler believes these towers will put up such a ferocious barrage
02:47that no enemy plane will dare fly over the German capital again.
02:53Obsessed with detail, Adolf Hitler pays careful attention
02:57to the architecture of these towers.
02:59He made sketches, he designed air raid shelters, he designed flak towers,
03:04and he wanted to take part in this kind of development.
03:08Built on concrete foundations eight feet thick,
03:11the flak tower has a footprint of 53,000 square feet,
03:16nearly the size of a football field.
03:18The massive exterior walls are eight feet thick and seven stories tall.
03:25Capping it all is a concrete roof 11 feet thick,
03:30enough to withstand a direct hit by allied bombers.
03:34Sixteen gun platforms complete the tower,
03:38giving 360 degrees of fire cover.
03:44To erect one of those flak towers,
03:47it was necessary to have 100,000 tons of ballast,
03:5278,000 tons of gravel,
03:5535,000 tons of cement,
03:589,200 tons of steel,
04:01and 15,000 cubic meters of wood.
04:04So the biggest problems for the Germans
04:07was the transportation question.
04:09It's a race against time.
04:11The Nazis alter the national train timetable
04:14to deliver 1,600 tons of material every day of the week.
04:18They also commandeer barges from France and Holland
04:23to bring more supplies by water.
04:261,000 laborers work day and night,
04:30completing the flak towers in just six months.
04:38A separate radar tower scans the sky for incoming enemy bombers.
04:45It's designed to detect planes many miles away,
04:48then retract down a 40-foot shaft
04:51before the bombs start falling.
04:56The combination of immense fire power and high-tech radar
05:00puts a protective dome over the city.
05:07Joachim Karau is drafted to work in the tower when he is just 15.
05:12In 1944, I was recruited with my entire school class
05:24to become flak helpers.
05:26We first worked on the searchlights,
05:29and later we were trained to help on the triple guns.
05:33And, before you have a...
05:34Bombing Berlin becomes one of the world's deadliest jobs.
05:42Casualty figures for Allied bombers are horrific.
05:46After the war, the Allies tried to destroy all three flak towers.
06:07At Humboldt-Tine, the French only manage half the job.
06:10They spare the structures that stand too close to the railway line.
06:16Then, they bury the tower in a mountain of rubble, wiping it from history, until now.
06:26Every year, we find some forgotten history of Berlin and try to open it, to discover it, to document it, and to show it to the public.
06:36Sascha Keil is an historian and leading member of the 300-strong Berlin Underworld Association.
06:46Their headquarters is a wartime air raid shelter hidden under a subway station.
06:52And their mission, to uncover the lost history of underground Berlin.
07:04Over the past ten years, they've found a secret city beneath the streets, locating a hundred bunkers and charting more than 25 miles of tunnels.
07:16In the process, they've created a detailed picture of the Nazi capital.
07:26Their detective work is invaluable in understanding Hitler's Berlin, because today's city looks nothing like it did in 1945.
07:35Allied forces destroy 90% of Berlin.
07:40Bombers pound the city day and night.
07:44Then, over two brutal weeks, the Russian army blasts its way street by street into the city center to finally end the conflict.
07:54After the war, the Allies flatten many of Hitler's key buildings, destroying most traces of the Nazi regime.
08:01But underground, a network of bunkers and tunnels survives, providing a gateway back to everyday life in Nazi Germany.
08:13British historian Antony Beaver has written a definitive account of the fall of Berlin.
08:25Together with Kyle and his team, they head off-limits into the dangerous depths of the humble Tyne Tower.
08:34So, on the right side now, right around the corner, we have many thousands of cubic meters of rubble.
08:43So, with this great big curve on it, is it still safe?
08:47Is it safe? Yes, I can say. Because of the strong steel nets, they are still intact.
08:55Though Beaver's written extensively about wartime Berlin, this is a world he's never seen before.
09:02To the next level. This is the third level? Yeah. And you see, it's the middle of the building. Yes. Look at that.
09:15It's a treasure trove of the deadly, daily business of war.
09:20It's only a small collection of what we found. Yes. Some boxes for the gas masks for the soldiers.
09:26That's right, yes. Remember the pictures. The kill scuttle helmet? Yes.
09:30Yes. This is definitely smaller than the normal one. I think these are the small helmets were specially made for the Hitler Youth and for the flak helpers who are all about sort of 15, 16.
09:40Now, what about those? These are the larger shell cases, are they?
09:43I think it's a 12.8 from this flak tower. 12.8 centimetre, it could be. But they had a lot of calibers in this building. This is the largest calibre they used here at this flak tower.
09:57Mm-hmm. How many of these were they firing a minute in, out of their guns?
10:0112 in a minute. 12 a minute. And what was their range?
10:0614 kilometres from the sky.
10:08The Nazis designed this building like a huge belt-loading weapon. The guns sat on the roof, and the shells were stored here in the basement. They were connected by a mechanical hoist.
10:29It was filled with storage layers. So they were stacking, what, all the ammunition here? Yeah, in different layers. On the racks.
10:40And this ammunition chamber was a bunker in the bunker, you could say. Yeah, yeah, yeah.
10:44At the corner, you can see the rest of the ammunition lift.
10:49These belts carried the shells to the rooftop guns.
10:52It looks always like the skeleton of a dinosaur.
10:55Yes.
10:56So it went round and round and round in a sort of a conveyor belt.
10:59The end of the shaft was protected by a huge dome of steel.
11:04Mm-hmm. Or to prevent any bomb or incendiary coming down inside.
11:07Yes, exactly.
11:09Dinosaur skeleton, to remember that.
11:12But this huge fortress has another purpose, a shelter for the people of Berlin.
11:19We now stand in the gas lock of the former, one of the former entrances here in Tower C.
11:26Mm-hmm.
11:27This is the only written evidence we found so far in this building.
11:33It's written in bigger letters, open to the public, civil bunker, civil air raid shelter, second floor.
11:41Yes.
11:42With an arrow in this direction.
11:45The Nazis provide space for 15,000 civilians inside the fortress.
11:51There's even a hospital.
11:53And one tower stores the city's great art treasures, including a priceless 3,000-year-old bust of Nefertiti.
12:02Gunter Schubell, then a small boy, remembers life cocooned in the concrete fortress.
12:09It was like a castle with lots of people running around.
12:14It was exciting.
12:16There were windows that we closed that night.
12:19I felt safe.
12:22I remember there being three beds on top of one another we slept on.
12:32These triple bunks are instantly recognizable to a generation of Berliners who called the bunkers home.
12:39Just yards from the flak tower, the Berlin underworld team hunts for a wartime bunker.
12:54After the war, it was dynamited and landscaped into a city park and eventually forgotten.
13:01Until an old aerial photograph offered some intriguing clues.
13:10If the team's suspicions are correct, they'll be the first people inside the bunker in over 60 years.
13:19There's another clue, a piece of exposed concrete that might be a corner of the bunker's roof.
13:27Now, they just have to dig and hope.
13:33A few hundred yards from the Brandenburg Gate lies another of the Berlin underworld's ongoing projects,
13:40and a great secret of Nazi Berlin.
13:46Buried 60 feet beneath a city park are the foundations of Hitler's ultimate dream, the Thousand Year Reich.
14:00This access shaft leads to the start of a train tunnel 240 yards long.
14:06But this isn't part of any ordinary transport network.
14:11This is the beginning of Germania, Hitler's futuristic vision for Nazi Berlin.
14:18We now walked about 220 meters, the length of the tunnel.
14:25Hitler wants to rebuild the city and worries over every architectural detail.
14:32Germania is his vision of a super-sized Berlin, bigger and bolder than any other city on the planet.
14:41Everything is colossal.
14:45A victory arch twice the height of the French Arc de Triomphe, a central avenue broader than the Paris Champs Elysees,
14:54and a great hall large enough to swallow St. Peter's in Rome.
14:59To many historians, Germania is nothing more than a dictator's fantasy.
15:06But this tunnel shows that Hitler's dream has roots set in concrete.
15:11In Germania, the Fuhrer demands a huge square where he can address one million Germans face to face, and his architects deliver.
15:21The idea was to create a traffic-free square in front of the Great Hall.
15:30So these tunnels were built, meaning the new transport hub for Germania was completely underground.
15:40In 1938, workers close the main avenue from the Brandenburg Gate
15:45and begin constructing three underground traffic tunnels.
15:50Nazi engineers dig down 60 feet, lining and capping a two-way train tunnel with concrete.
15:58Above that, they encase two car tunnels in even more concrete before restoring the street above.
16:08But two years later, in 1940, the British start bombing Berlin.
16:13The tunnels are abandoned and never carry any traffic.
16:20They were used as ammunition dumps during the war.
16:24They were also used to make armaments.
16:28They were all part of the whole bunker building program.
16:32These ad hoc shelters become part of daily life for Berliners.
16:37By 1945, Allied bombers hit Berlin day and night with fleets of planes sometimes 2,000 strong.
16:48Berlin is now the most dangerous place on the planet.
16:54To be caught out in the open usually means instant death, and yet many Berliners survive.
17:01The reason lies in one of the greatest engineering projects of all time.
17:09The construction of secret bunkers, tunnels and public air raid shelters.
17:15An underground city complete with command posts, weapons factories, hospitals and even radio stations.
17:24Hitler's Führer bunker, his final headquarters, is an impregnable concrete monolith deep under central Berlin's Reich Chancellery.
17:38But it's just one bunker at the heart of a network of civilian shelters, numbering over 1,000 in Berlin alone.
17:52In total, the Nazis poured 200 million tons of concrete for bunkers across the Reich.
17:58Today, in the city center, the Berlin Underworld Association makes a rare descent into one of these civilian shelters that's lain largely undisturbed since World War II.
18:19They've teamed up with Anthony Beaver, award-winning historian and an expert on the fall of Berlin.
18:29In Berlin, you can only really do it underground. The whole of the rest of the city has changed completely.
18:33And this, in fact, is, if you like, the last few sort of precious elements left of Berlin in 1945.
18:39As you can see, we're entering this mother and child bunker through a normal gas block.
19:03Mm-hmm.
19:04You can read this in German here.
19:06Yeah, yeah.
19:07And, uh, during an air raid, all the doors in the bunker were closed to protect the people inside from, not only from the poison gas, but from the, uh, fire outside because of the streets were burning.
19:22At every deep bunker and tunnel, you had to, to pump out the water all the time.
19:37Because, well, Berlin had such a high water table.
19:39Yes, yes.
19:44Aufsicht.
19:45Aufsicht, ja.
19:46Yeah.
19:47Germany means the kind, uh, reception, like a hotel or office.
19:51Tell me, one of the things that they were checking, presumably, is, uh, to make sure that there weren't any, say, foreign workers coming in.
19:57I mean, this was strictly reserved just for Germans.
19:59Yeah.
20:00And the passport, you saw the signs, if one is German, mother with a child come in, only Aryan Germans were allowed.
20:07No foreign workers, no slave workers, no Jews.
20:12I never saw a bunker with so many signs at the walls and in such a good shape.
20:18It's amazing.
20:22Originally an abandoned train tunnel, this bunker takes just six months to complete.
20:28It holds 99 rooms along three corridors, enough for 1,300 people.
20:33The reinforced ceiling is made of ten feet of concrete, and the exterior walls are five feet thick, making them virtually impregnable to bombs from above, but not from inside.
20:46Ah, this is interesting.
20:48This is, uh, an explosion happened here at the end of the war.
20:52Uh, an eyewitness told us a story that they were fighting, even in the tunnels, and, uh, perhaps destroyed, made by a bundle of grenades on anti-tank rampant.
21:03So even the air raid shelters weren't really safe for the women and children, I mean, because the Soviet soldiers would clear out and, um, and search through, and there was obviously fighting underground as well.
21:13Yeah.
21:14At the end of the corridor are signs that this bunker's been entered since the war ended.
21:23This is a newer wall, uh, so you can see we are not the first in this bunker.
21:29It's part of the underground Berlin Wall.
21:32And we are now under the Berlin Wall, so the bunker continued in this direction.
21:42The communists sealed this bunker during the Cold War, but the explorers know there are still dozens of bunkers left to uncover.
21:51Back in the park, the other teams still digging to get inside their latest bunker discovery.
22:05They've created an opening just big enough for their slimmest archaeologist to squeeze through.
22:13They tie a lifeline around his foot so they can pull him out of any danger.
22:22It's been 60 years since this bunker was sealed.
22:28And although they've shored up the opening, they have no idea how stable the interior is.
22:40Tension is high.
22:41Tension is low.
22:42But it doesn't lie.
22:43Tension is right.
22:44Don't shut down there.
22:45He has a prescription?
22:47Tension is low.
22:48Tension is low.
22:51Tension is low.
22:52Tension is low.
22:54Tension is low.
22:56Tension is low.
22:57The support team waits anxiously for news from inside the bunker.
23:00He is low.
23:02Tension is low.
23:03Tension is low.
23:05Tension is low.
23:06made it. But the video he passes back brings bad news. Rubble blocks the way.
23:21They're tantalizingly close to their goal, but they need to find another way in.
23:29Throughout March 1945, bombs fall on Berlin seven days a week. Then, in April, the Russian
23:38army reaches the outskirts of the capital city. April 21, 1945, one last air raid, and then
23:47the city goes quiet. A silence more terrifying than the sound of war.
23:55Well, there was what they called a battle pause. I don't know what it meant, but they said
24:04it was quiet before the storm, said the soldiers. And so we all waited.
24:18The Soviets begin the largest artillery assault ever seen.
24:25There was no warning, nothing, you know. And you could see those rockets fly over your head,
24:41you know, like a black shadow.
24:47I just can't describe it. Whee, whee, whee, whee, whee. It went like that. And,
24:54you know, your brain was just cooking, I thought. Like, my brain was cooking from that noise. It was
25:02the most terrible noise I've ever heard.
25:08In just two weeks, they fire almost two million shells. But then, in North Berlin,
25:15the Red Army meets an immovable object. They target their biggest guns on Humboldtine Flak Tower.
25:29There were small cement clouds, and around the windows, the walls came down.
25:34We laughed a little that the architects never thought that one day, this bunker would be shot at from the
25:41ground.
25:51Today, the impact of the Russian shells is clearly visible. But the huge walls stand firm,
25:58and the Russian infantry is forced to go around the tower. The remaining German army fights the Russians
26:04street by street.
26:23Yards from the tower, after digging for two days, the team finally secures safe access to the bunker.
26:34The bunker is full of giant boulders, but the excitement of a new discovery is still there.
27:04The first impression is amazing. Big blocks of concrete, the biggest I ever saw.
27:25As the Berlin Underworld team explores the park shelter for the first time in 60 years,
27:31they start to make sense of its layout and dimensions.
27:34And inside of each room there was two beds, with three levels for two to three families.
27:58Some rooms are recognizable, but the Berlin Underworld discovers a new enemy that's slowly destroying the bunker.
28:12These are roots from the trees above in the Humboldtine Park, and they really destroyed this bunker.
28:21Not even the war, all the bombs destroyed it, but this war successful, a tree destroyed this bunker ceiling.
28:34It's amazing.
28:34It was a very important building, and it was one of the first huge buildings that were planned by the Nazis.
28:57And Adolf Hitler made it his personal project, and he wanted it to become the largest and the most beautiful airport of the world.
29:07Templehof Airport is full of swagger. Everything is oversized. Covering just over three million square feet,
29:19this colossal showpiece is designed to dazzle both foreign visitors to Nazi Berlin and the German public.
29:26Hitler wanted this airport not only to be an airport, but to be an air stadium too.
29:32So the huge crescent shape of the airport has its reason in this idea to build an air stadium.
29:39Hitler plans to stage an annual military air show, and the terracing on the airport roof provides standing room for 100,000 spectators.
29:52The Nazi propagandists never miss a photo opportunity. From the air, it looks like the Nazi eagle.
29:59But the air shows never take place. Once the war starts, Germany needs to manufacture arms here instead.
30:14The Nazis built a huge underground industrial complex, turning out bomber and fighter planes between 1940 and 1945.
30:23Deep under Templehof lies a maze of tunnels that still house the airport's water and electricity plant.
30:38Years later, the Berlin underworld is still uncovering new secrets.
30:44These tunnels are for heating pipes, for example, for the electricity system for the old Templehof Airport from the 30s.
30:54We never counted them all, but it's said that all together we have a sum of six levels and 40 kilometers length, all the tunnels together.
31:08This wartime aircraft factory is entirely self-sufficient, with its own power and water.
31:16The labyrinth of tunnels even includes bunkers to protect airport workers from air raids.
31:23One bunker in particular stands out for its remarkable wartime murals.
31:39This shelter, you can read at the door, was for the employees of the German Lufthansa company.
31:52It was the biggest one, even in the 30s.
31:56I never saw a bunker with paintings in this good shape before, and they show some little stories, funny stories about the life in Berlin.
32:09It is to let the people sitting in this bunker think of other things than the war and the bombs outside.
32:23Deep underground, encased in concrete, the Nazis secretly build and repair Focke-Wulf fighters in this railway tunnel right up to the last days of the war.
32:45Parts of production line machinery still hang from the ceiling.
32:58Suspended from a motor-driven rack, Focke-Wulf fighter planes are moved down the assembly line.
33:04Once ready, the planes are pushed out of the tunnel and depart for the front lines.
33:15The dimensions of the tunnel are exact.
33:17We measured in this tunnel a width of 10.8 meters.
33:27The wingsband of the Focke-Wulf 190 fighter of the Germans was only 10.5 meters.
33:34So you have 30 centimeters.
33:37And you can imagine that the planes and the wings were only some centimeters swinging left and right in this tunnel.
33:45Templehof is crucial to the defense of Berlin, manufacturing and repairing some of the last aircraft of the Third Reich.
33:58But this factory holds a gruesome secret discovered only by chance.
34:11Something they never predicted.
34:15We found these metal cases about four kilometers south of Templehof airport in a weapons factory bunker
34:30that made parts for the aircraft industry.
34:34These are factory time cards with the names and nationalities of workers.
34:39There are 12,600 cards.
34:474,000 are slave laborers.
34:53As the Nazis plunder occupied countries, they take everything of value, including people.
35:00Forcing thousands of East European slave laborers to work at Templehof.
35:09In April 1945, Templehof is still making aircraft 24 hours a day below ground.
35:17While above ground, the battle rages on.
35:21The secret factory is hidden from enemy view.
35:24The Soviets just want the airfield for their own planes.
35:29After two days of bitter fighting, the Soviets finally seize Templehof.
35:35Berlin, April 1945.
35:42Berlin, April 1945.
35:45Hitler and the Nazi regime are now completely surrounded.
35:49With the Red Army just a few miles away, the deluded dictator loses himself in his fantasy of Germania,
36:00his massive reconstruction plan for the future Berlin.
36:03Outside, the terrified population takes refuge anywhere they can.
36:14In tunnels, attics and bunkers.
36:16Conditions worsen as thousands cram into the bunkers.
36:21The air was wet.
36:24You know, you could hardly breathe.
36:26And the people got off their clothes and they sat there with bare arms and bare shoulders.
36:34And you were still sweating.
36:35And it smelled terrible.
36:37You know, there were no deals like you have today or powders or any spray.
36:44You know, it smelled awfully.
36:48They were crammed in in such terrible numbers.
36:51I mean, if there were anything up to 50,000 in the zoo bunker, in the Anhanta Bahnhof, nobody could move.
36:59People couldn't even go to the lavatory.
37:00I mean, they just had to go where they stood.
37:02After years of anti-Bolshevik propaganda, many Berliners prefer even these conditions underground to facing the Red Army.
37:11Bolshevik, I didn't know what is a Bolshevik, you know.
37:14And I sat there and I just remember I thought they must be coming up the stairs anytime now.
37:25What will they look like?
37:26And that's what frightened me to death.
37:28People were without hope.
37:34They were anxious and they were fearing the Russians.
37:40People committed suicide.
37:42It's estimated that in April and May 1945, in Berlin and in the suburbs, some 100,000 people committed suicide.
37:51Whole families take their lives rather than submit to Russian occupation.
38:02Berlin is so dangerous, the Nazis now read the news from a bunker under the Reich radio building.
38:08We always transmitted from the radio bunker.
38:26It had a six meter thick ceiling.
38:28Nothing could get through.
38:30But the question we asked ourselves from mid-April was, who is still listening to us?
38:35The end is near.
38:41The Russians tighten their grip on central Berlin.
38:44Locals now call their city the Reich Funeral Pyre.
38:48But Hitler and his loyal henchmen will never surrender.
38:52Goebbels continues to transmit his Nazi propaganda to the end.
38:56In the last days of April, he spoke about the final struggle in Berlin and told us the Führer is still with us.
39:09We are still winning the war.
39:11We are still transmitting.
39:15But the defense of Berlin is futile.
39:1980,000 young boys, old men and exhausted soldiers fight more than a million Russians.
39:26By the end of April, Soviet troops attack the government quarter.
39:34This spells certain death for Hitler and his staff.
39:39But the Berlin underworld discovers that many Nazis were able to flee beneath the march of the Soviet army.
39:49This derelict bunker in the traffic ministry garden is the last escape route for desperate Nazis.
39:56For them, it's all over.
40:02Hitler leaves his bunker on April 20th to award medals to Hitler Youth for defending Berlin.
40:09To hide his ill health, he holds his trembling left hand behind his back.
40:1410 days later, with the Russians just streets away, Hitler finally accepts that the war is lost and kills himself.
40:26His inner circle follows suit, ending their lives with poison capsules or handguns.
40:32But for others, this is their cue to flee.
40:48Most of the groups try to escape to this direction.
40:51It's the best way to escape from the century in the government district to the north.
40:55To avoid the fighting on the Von Hormshaus.
40:57Yes, yes.
40:59They hope they can safely cross the main street underground and then follow the subway tunnels north
41:04as far as the river, escaping the raging battle above.
41:08So, here's the entrance to the connection to the subway system.
41:14You see the black ground on it.
41:16You see the words written in black on the yellow?
41:20Fluchtweg, Feuersturm.
41:22Escape way when firestorm comes.
41:26In black letters on the yellow.
41:28And the arrows point on this to go through the subway tunnel.
41:33And they walked some kilometers to the north, in this direction is north,
41:37and tried to escape through the train station at Fruttersstraße and over the Wiedendamer Bridge.
41:50Very few escaped the Red Army alive.
41:53Russian guns mowed down wave after wave on the Wiedendamer Bridge.
41:58It's all over for Nazi Germany.
42:06Richard Bayer remembers the words read to the nation on Hitler's death.
42:19In the final struggle for Berlin, Hitler fell with his troops for Germany.
42:25He fought for his ideas until the end.
42:28And after this transmission, Hitler's favorite music was played.
42:35Wagner and Bruckner.
42:48Two hours later, Bayer shuts down the station with the following words.
42:52We remember the heroic actions of the German soldiers on land, sea and air.
43:01The Fuhrer is dead. Long live the Reich.
43:03The battle for Berlin has ended.
43:11Mid the ruins, the flak tower at Humboldt Tine fights on for one more day.
43:17Then the guns fall silent.
43:19As the civilians emerge from their bunkers, blinking into the sunlight, the Berlin that greets them is unrecognizable.
43:33You could hardly work out where the streets had been.
43:35I went with my sister to Alexanderplatz to look for an uncle's house.
43:41But you couldn't tell where the streets were.
43:44Hitler's grand buildings and monuments lie in ruins.
43:54After four years of bitter warfare, the Russian army celebrates a bloody victory.
44:12Berlin's slave workers begin their long journeys home.
44:16While the Allies forced the city's residents to clear the rubble brick by brick.
44:25At street level, all traces of Nazism are removed.
44:29Underground, it's a different story.
44:32Beneath the rubble of the ruined Reichstag in Berlin,
44:34workmen discover underground passages leading to air raid shelters once used by members of Hitler's government.
44:40Here fled the Nazi Stooges, whose dreams of world conquest ended up in a nightmare of fire and fury raining down from the skies.
44:55There are still dozens of undiscovered Nazi bunkers under Berlin.
45:00Enough to keep the Berlin underworld busy for years to come.
45:04Inside, the final secrets of the dying Nazi regime remain.
45:14Waiting only to be revealed.
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