In r/l HQ would occasionally order a sub to meet up with a damaged sub to send over spare parts.(primarily engine and electronic parts),but rescuing an entire crew was only done once as far as I can recall. When the Darter ran aground I believe the Dace and possibly another sub rescued the crew...which was ballsy since it happened during the Battle for Leyte Gulf not too long after the Darter and Dace had smacked down 2 Heavy Cruisers and damaged another one. The Japanese weren't all that far away at the time.
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