Second World War German pressure test tank for type XXI-submarine pressure hull-designs at the Germania Werft, Kiel, Germany

Naval History and Heritage Command. NH 96280

Type XXI-class ocean going diesel-electric submarines preceded by the VII-, IX- and XVIII-classes of which the latter was cancelled and to be succeeded by the not completed XXVI-class. The XXI-class was built between 1943-1945 at the shipyards of Blohm+Voss, AG Weser and Schichau-Werke. Designed as the first real submarine serving primarily under water. At the Maritime Museum, Bremerhaven is the last floating example preserved namely the U-2540.

Naval History and Heritage Commans. NH 96282. 

German type XXVI submarine pressure hull test model, 1: 1.5 scale

“Looking aft, circa 1945. This type of submarine featured a dual-diameter pressure hull for side angled torpedo tubes. The model was not tested before the Second World War ended.”

Naval History and Heritage Command. NH 96283 

German type XXVI submarine pressure hull test model, 1: 1.5 scale

“Port side view, circa 1945, showing "break" in pressure hull diameter to accommodate side-angled torpedo tubes. The model was not tested before the Second World War ended.

German submarine (ex-U2540 1944-1960) Wilhelm Bauer 1960-nowadays. 

Maritime Museum Bremerhaven, Germany