They were built out of amagnetic steel to counter the threat of magnetic naval mines, but the material had been insufficiently tested and proved to be problematic in service with the Bundesmarine. Microscopic cracks in the pressure hull forced the cancellation of nine of the twelve ordered submarines and the rebuilding of the first two boats as Type 205 submarines. Responsible for the design and construction was the Ingenieurkontor Lübeck (IKL) headed by Ulrich Gabler.
intentionally destroyed in trials in high pressure chamber "Dock C" (Marinearsenal Kiel 1971), scrapped
U-3 was loaned to the Royal Norwegian Navy and served under the name Kobben from between 10 July 1962 and 20 June 1964 before being commissioned in the German Navy.[2]
Citations
^"Nieuwe Duitse Onderzeeërs"(PDF). Klaar Voor Onderwater (in Dutch). Vol. 37, no. 129. Den Helder: Onderzeedienst Reünistenvereniging. September 2014. pp. 13–17. ISSN2214-6202.