Im Inneren der U-47 – Hitlers U-Boot, das Scapa Flow knackte

Inside the U-47—Hitler's most famous submarine and the deadliest machine of the Kriegsmarine. Under Günther Prien—the "Bull of Scapa Flow"—it accomplished the impossible in 1939: penetrating the British main naval base of Scapa Flow and sinking the battleship HMS Royal Oak. 833 sailors died. Prien became a hero of the Reich—a Knight's Cross and Oak Leaves awarded by Hitler himself. But behind the heroic facade lurked a machine riddled with weaknesses: defective Pi-1 magnetos, an 18.5 mm pressure hull at its limit, and a mysterious end in March 1941. In the video, we show the inner workings of this steel wolf and why Hitler's greatest submarine ace vanished without a trace. What made the U-47 the most dangerous submarine of the war? How did Prien achieve the impossible in Scapa Flow? And why did the most famous submarine disappear without a trace? You'll find the answers in this look inside a legend. 📌 CHAPTERS: 00:00 Introduction: The Bull of Scapa Flow 01:30 Germaniawerft 1938: 750 Tons of Steel 03:30 The Pressure Hull: 18.5 mm St 52 06:00 Germaniawerft F 46: The Diesel Heart 08:30 AEG Motors and Lead-Acid Batteries 11:00 Saddle Tanks: When the Whale Dives 13:30 The TDC: Mechanical Computer Made of Brass 16:00 G7a and G7e: Two Torpedoes, Two Worlds 18:30 October 14, 1939: Kirk Sound to Scapa Flow 21:00 HMS Royal Oak: When the Pi-1 Fuze Fails 23:30 ASDIC and Depth Charges: The Hunt Begins 25:30 March 7, 1941: Implosion in the Atlantic ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 🌊 ABOUT THE U-47 The U-47 was a Type VIIB submarine, built at the Germania shipyard in Kiel, Germany, and commissioned on December 17, 1938. At 66.5 meters long, with a displacement of 750 tons and an 18.5 mm pressure hull made of St-52 steel, it was one of the most modern vessels of its time. Its commander, Günther Prien, made it a legend. In the engine room, two Germania shipyard F-46 diesel engines with 2,800 hp each operated, supercharged with Roots blowers. For diving, the crew switched to two AEG electric motors, powered by 60 tons of lead-acid batteries. 17 knots on the surface, 8 knots underwater—and virtually silent. The diving mechanism: Saddle tanks on the sides filled with seawater via flood valves, and vent valves released the air. The boat lost buoyancy in seconds. Trim tanks and diving planes allowed it to be balanced with centimeter precision. The heart of the armament was the mechanical TDC (Torpedo Control Unit). From hundreds of brass gears and a gyroscope, it calculated firing angles and depth in real time. U-47 carried two types of torpedoes: the G 7a—air-powered, fast, with a bubble trail—and the G 7e, electric, slower, and without a trace. Both were ejected via hydraulic pistons and torpedo tubes. On October 14, 1939, Prien steered U-47 through the narrow passage of Kirk Sound—past barriers and blockships—into the main naval base at Scapa Flow. The first torpedo salvo at HMS Royal Oak failed: Three of the four Pi-1 magnetos detonated too early. Only the second salvo hit—and triggered the ammunition magazines in a hexanite explosion. 833 British sailors died. But this triumph became a trap. The Royal Navy modernized its ASDIC sonar and deployed depth charges extensively. What was invisible in 1939 became a death sentence in 1941. On March 7, 1941, naval command lost radio contact. British destroyers had previously defended Convoy OB-293 — a series of depth charges from HMS Wolverine may have hit the submarine. Other hypotheses: a self-inflicted torpedo fire. At a diving depth of approximately 250 meters, the pressure hull gave way, and the steel shell imploded. All 45 men — including Priens — perished. The truth about the disappearance was concealed by the Reich for months. It wasn't until the end of May 1941 that the Wehrmacht announced the loss. Hitler's greatest U-boat ace had vanished into the Atlantic. The story of U-47 is a cautionary tale: a triumph of German engineering — and a reminder that even the best steel is no match for the physics of the Atlantic. Hitler's lost bull. ... ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 🔔 SUBSCRIBE for more inside information on legendary weapons, tanks, aircraft, and ships – from the Wehrmacht to the Bundeswehr. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ⚠️ NOTICE This video is for historical, technical, and educational purposes only. It does not glorify National Socialism or war. The animations shown are reconstructed and based on publicly available historical sources. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ #U47 #ScapaFlow #MilitaryHistory