If I'm not mistaken about the name, Erich Topp reported that he was spotted by a destroyer and his boat damaged heavily while being submerged at 20 metres, or so, and not doing anything for quite a long time - no shooting, sailing, surfacing. They just rested under the waves and then suddenly... DD. They were DC almost to death, after three days spent on the seafloor managed to repair the boat and surface, ti find a trawler left there... just in case the submarine would surface again.
So... what did you say about their efficiency?
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