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I'm a little upset. Are they now going to build rectangular submarine 
pressure hulls due to inherent strength of "flat-sided" pressure 
vessels? Actually there are some flat bulkheads inside submarines which 
separate compartments in the event of flooding that are DESIGNED to 
take submergence pressure. They are quite massive with the structure 
necessary to do so as hemispherical internal bulkheads would take up 
too much space.  This is a design tradeoff. Later class submarines had 
fewer pressure rated internal bulkheads for several reasons, one of 
which was to reduce the weight of the submarine (it does no good if it 
only sinks!) Its been a few years from my years in the sub service and 
engineer at Electic Boat, but I think submarines are still somewhat 
round and not square? There must be a reason!

Doug Chapman

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