I read my hull integrity in percentage points in SH3 Commander ... when it reaches below 75% I know I need to rectify or return to port as an engagement can be treacherous starting with that much damage to my hull (immerision pucker factor). A deep dive could implode my boat ... when 100% could meet max depth design specs. (immerision pucker factor).
If I can get to a milch cow I have found when reloading the sim, my hull has been repaired to 100% again as well as fuel, eels, and candy for the crew.
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DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol:
http://www.uboat.net/today.html