I don't have much to add in terms of factual data, but I can tell you that if you travel with 'desk awash' in SH4, the dive time is greatly reduced, mainly because the dive-planes are already run out and (I guess) the boat is already cloaser to neutral boyancy.
I only travel this way on the surface during the day. Even with the short range of the "Plane!" calls, I am under long before the plane can get to me.
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\"One ping to find them all,
One ping to link them;
One ping to promote them all,
and in the darkness sink them.\"
with apologies to J.R.R. Tolkien
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