I ran into this problem with a Gar class boat in late 1942 east of New Guinea. I also got bombed at a depth of 160 ft. on the same patrol, but I think that was in day light. I've now learned that either you run at periscope depth with the SD radar antenna raised to get a warning or stay down at 200 ft. For high TC, 200 ft. is the better option.
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