In data crew_config_ cfgs there entries for hitpoints and health status for crew members , some of they have values and others not.
Morale=0.000000
Fatigue=0.000000
HealthStatus=0
HitPoints=0.000000
Experience=0
But probably some thing could be missing or the game engine donīt use these cfg files, for example there are files for other submarines types like II, IX and XXI