Part of the problem is that when diving normally in real life the ballast tanks aren't fully flooded. The idea is to get the boat underwater, but not so deep that you can't return to periscope depth immediately.
A crash dive is the only dive that involves getting the boat underwater as rapidly as possible, so it's the only one that involves fully flooding the tanks, running water to the forward trim tank and full down on the planes.
So a normal dive shouldn't get you under as quickly as an emergency dive.
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