True, a submarine must maintain some forward motion to sustain depth. Some say the sub will rise and others say it will sink if there is no forward motion. That argument went on for sometime in SH3. At any rate, I believe this is hardcoded in SH4 and can not be addressed. There was some discussion at the RFB forums about this and I believe determined that this can not be modeled in SH4.
I do not have the answer for your last two.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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