Lucky you, I'm in December '41 and am now having trouble getting past the first line of escorts. I managed to sight a convoy and position myself in front of it, about 110m down. All Stop, rigged for silent. I am repeatedly getting picked up, then blasted with active sonar.
I might have to revert to my old tactic of eliminating the lead escort by baiting them into charging at me and hoping a down-the-throat shot works.
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