Qualla: German submarine U-777

German submarine U-777: Introduction

Sun, 17 May 2026 00:00:00 GMT

She had been in commission for one hundred and fifty-nine days. Her crew had practiced attack runs and emergency dives in the protected waters around Pillau and Danzig, working their way up the qualifications ladder of the 31st U-boat Flotilla. They had never fired a torpedo at a real ship. On the night of 15 October 1944, at 20:02 exactly, RAF Bomber Command flattened the U-boat pens and surrounding port at Wilhelmshaven, and U-777 - moored, dark, helpless - went down at her berth with one of her sailors aboard. Her commander, Gunter Ruperti, would survive to take over another boat five months later. U-777 herself would never put to sea on a combat mission.

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German submarine U-777: Type VIIC, Late Model

Sun, 17 May 2026 00:00:00 GMT

U-777 was a late-war Type VIIC, the workhorse class that built the U-boat arm. She measured 67 meters long, displaced 769 tonnes surfaced and 871 submerged, and was powered by twin Germaniawerft diesels above water and twin Garbe-Lahmeyer electric motors below. Her topside armame...

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German submarine U-777: A Single Career

Sun, 17 May 2026 00:00:00 GMT

She had only one commanding officer: Oberleutnant zur See Gunter Ruperti, who took her from her commissioning on 9 May 1944 straight into training. The 31st U-boat Flotilla was based in the Baltic, where the relatively safe waters allowed new crews to learn the dives, the trims, ...

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German submarine U-777: Wilhelmshaven, Night of 15 October

Sun, 17 May 2026 00:00:00 GMT

By the autumn of 1944, the great fortified U-boat base at Wilhelmshaven had become one of the most heavily bombed targets in the Reich. RAF Bomber Command and the US Eighth Air Force took turns at it, working through the bunker pens and the surrounding docks. U-777's records simp...

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German submarine U-777: The Commander Who Lived

Sun, 17 May 2026 00:00:00 GMT

Gunter Ruperti's story did not end at Wilhelmshaven. Promoted to Kapitanleutnant, he took over a new boat - the Type XXI U-3039 - in March 1945, only about five months after U-777's destruction. The Type XXI was Germany's late-war wonder weapon, a true submarine designed to live ...

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