It helps to read instructions. In GWX you can put your overflow of men into the Electric motor room and they lose health very, very slowly while you are running on diesels. (They don't, however, revive, but that's okay.) Unfortunately, the reverse isn't true. If you're submerged and put men in the diesel room they lose health kinda fast.
Nevertheless, this helps in crew management (especially in 1x TC) because you can revive others while members in the E-room are on "ice". Nice!
