Been following this for a while, don't think it is a u-boat, whilst I don't have a definitive scale for the sonar image it is fairly short, too short to be a VII, IX or XXI. It also shows a flat deck, eliminating type XXIII as they had pretty much no deck, leaving type II's. There were 4 type IID's sunk during operation deadlight, however the image shows a pronounce bulbous deck and although the type II's had a bulbous deck it was much slimmer
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