The U-boat WILHELM BAUER (U 2540) of the year 1945 in the museum harbour. The U-boat is not used by the German Maritime Museum but by the association "Technikmuseum U-Boot WILHELM BAUER". The boat is the only remaining preserved example of type XXI which was no longer deployed at the end of the second world war. It attained the feat that a vessel could travel almost as fast under water (15,6 knots) as above it (17,2 knots).