I can make it easy. Our water is a flat 2-D plane. To make it 3-D would require all sorts of new coding & a total overhaul of our new terrain system. Plus, a sub is not going to catch a CV. Would you really want to sit for a RL week in a sub waiting for the 1-in-a-1000 chance that a CV would happen to show up in the exact right place & time for one torp shot? All that development time & effort would be better spent updating our old planes & getting new ones IMO.