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I would be most appreciative if anyone could tell me the numbers of the submarines operating from Helgoland or around Helgoland (based elsewhere) during WWI.
If possible, I am looking for a particular submarine that was operating off the coast of Helgoland on or around 10 October 1917. I have already ruled out U25 and UB148.
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I read where the British tried a submarine trap operation with hydrophone equipped trawlers, DDs, mined nets, etc in early October 1917 in the Dogger Bank area along a common route used by Ger. submarines. That would be quite a bit west of Helgoland.