if we could control the dive planes manually can we also control the ballast tanks to pump some water to lighten the boat a little bit. in current situation, the boat need so careful fine tunes at depth and so heavy load on the dive planes, she can even not take any tiny flood by battle damage. this is really a risk job, only super man can handle it. beside the kapitan's job is mainly on the battle, to control the depth is not his concern in the most of time. I really hope that I can spent more energy on evading the enemy destroyer instead of this stuff.