Just thought about this, if you change the displacement, you may wind up changing the turning radius, acceleration/decceleration and other operations that are affected by mass. Would also make it harder or easier (deopending on which way you go) to drive to the surface with flooding.
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"There are only two types of ships- submarines...... and targets" Unknown
"you wouldn't catch me on a ship that deliberately sinks itself"- comment to me from a surface sailor. 
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