Hmm, doesn't sound right.
But I use Dark Wraith's mod, not stock. If you press the crash dive button with this mod enabled you teleport to the radio room and then, after a defined interval, the boat dives.
Otherwise, if I move to, say the conning tower, and then press "C", the sub will crash dive without problem.
Unless I'm in 15m of water...
Maybe a mod conflict you have?
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