i rarely use crash dive. As soon as a threat is detected i hit flank speed "5", wait till she gets up to speed, then hit "d", and you will knife under nicely. aside from the all the issues with crash dive, i think you actually submerge slower because you beigin to submerge immediately, before you get full speed. When using d, just be sure to choose a depth you want once you get under, or you will go all the way down
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