When you order a crash dive the boat will automatically level off at whatever the preset crash dive depth is in the game files. Default is 70 meters. You can change the preset crash dive depth in in the appropriate files(s), but whatever it is, you should let the boat finish the dive and level off at that preset depth before ordering a new one.
There is/was a bug known as the "crash dive blues" which caused the boat to continue diving out of control if you ordered a different depth in the middle of a crash dive (which would be done by clicking the desired depth on the depth gauge). I seem to remember reading something about this bug being fixed some way or another but I'm not sure, maybe someone else can elaborate on that.
Basically though when you order a crash dive you are telling the engineer to dive the boat at the steepest possible angle at flank (emergency) speed in order to reach a previously agreed upon depth as quickly as possible in an emergency situation and the game doesn't seem to like it if you change your mind in the middle. Given the RL physics of it, it's doubtful that you'd be able to "pull up" sooner in that situation anyway in a real boat.
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