Dive deep 160 metres + and keep quiet 2 knots or less works for me. I don't take on escorts unless absolutely necessary or if they present me with an unmissable shot i.e. sailing in a straight line right past my tubes.
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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