With regards to your second question, if you're in a situation where you are blowing your ballast tanks you probably are intending to surface. Otherwise if you just wanted to change depth, you use the planes. So no, you wouldn't blow ballast and then turn around and re-flood the tanks. To do so would be a waste of a limited resource, compressed air.
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USS Kentucky SSBN 737 (G)
Comms Div 2003-2006
Qualified 19 November 03
Yes I was really on a submarine.
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