Makman I notice the down buoyancy in NYGM but see neither up or down in GWX like you.I will be honest and say I thought that was so kool in NYGM when I first saw it but then started wondering is it realistic.There is a guy in command room standing in front of a multitude of valves(Diving officer?).Isn't his job to play with all the valves to fill drain the main ballast and the trim fore/aft tanks?So when your at 0knots he would add/subtract to keep the bouyancy and hence depth the captain asked for.
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