I am really curious about this, Kapitän:
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Originally Posted by Kapitän
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2) Procedure in the operational area North Atlantic when cruising and stopping in position.
a) By night: One electric motor slow to half speed, other motor Diesel ready to start up. Boats ventilator switched off. Reason for this: To be able to confirm approaching aircraft by hydrophone. MG ready and manned.
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How did they accomplish that? Thank you!