Did you go to external cam and do a search of the area the noise came from? Might be an easter egg the dev's came up with.
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U-73: Type VllB
Commissioned: 30 Sept, 1940
Career: 15 patrols
Successes: 8 merchant ships sunk for a total of 43.945 GRT
4 warships sunk for a total of 22.947 tons
3 ships damaged for a total of 22.928 GRT
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