I have on several occassions ordered a crash dive, then immediately hit Periscope Depth, and have never had a problem.
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Originally Posted by CptGrayWolf
I don't see why the chief can't level the boat at 50m... :hmm: maybe the experts out there will tell us.
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I'm no expert on submarines, but as I understand it there are preset procedures for different types of dives. All vents must be closed before the dive order can be given, which is why you must first go to periscope depth and then come back up to Decks Awash. A standard dive means flooding the tanks to a certain preset level, whereas a crash dive requires full flooding then blowing some back out in order to get the boat down faster.
70m? 50m? I don't know what the deciding factor would be, unless it's not mechanical, but rather doctrine. Several people have the U-Boat Commanders' Handbook. Maybe one of them can find it.