I agree with Sailor Steve. Historically, U-Boats were only supposed to pick up at most a handful of survivors who might be of intelligence value. For instance, on uboat.net you will often read that the master or 1-2 officers of a freighter were captured after it sank. This would be a nice feature immersion-wise for SH5 - perhaps you could gain some extra renown if the survivors gave up vital intelligence info. Codebooks, convoy charts, signalling codes, & other documents being recovered for renown would be a nice touch too. But full-fledged search & rescue is a bit much.
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