Crunch
I too avoid hitting bottom by pressing 'P' right away after crash dive. You might also try using the 'A' key once under which attempts to level off.
Don't forget to slow it down too.
If you do a look outside and see bottom coming up, you could press 'E' which is blow tanks, then press 'P' and see if that helps.
Anyway, hitting bottom at slow or stop speed is better than if moving faster. You won't get damaged. I usually hit hard left or right turn, slow or stop engines once underwater. Get it level, then speed up.
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