It's disappointing that SH4 doesn't have an "abandon ship" option. You either die or make it back to base, no other choices.
Have any of the modders looked at this?
Even a simple static screen after selecting "abandon ship" showing a raft at sea and a message saying "You and your crew were picked up by a friendly destroyer" (your career continues) OR "You and your crew were picked up by an enemy vessel and you were interned in a Japanese prison camp"(your career ends).
Hopefully, SH5 will have something along these lines for the U-boats in the Atlantic.