Sink them, and then ask questions 
They're probably using one of the ship models with lights, though I'm not sure if that's how it's supposed to be.
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Lt.z.S. Barbaros Hayreddin, U-35, 2nd Flot/Kiel, Type VIIB
Oct.29.1939, 2nd Patrol Eastern English Waters
Running SH5/TWOS
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