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 This link is very good. Be sure and move your mouse 
over the reconstructed hull and click on the different highlighted sections for 
popup info articles on them. 
This link talks about stiffiner rings, weight to 
ballast ratios, and a LOT of other things we have been discussing recently 
at Psubs. This is a good site for 
veterans and newbies alike. It covers a lot of 
things that are just as valid today as they were then. Some of the new members 
here have been discussing 
and contemplating different ambient and 1 atm 
designs. This site may help you understand things better and give you some 
ideas. Trust me.  
Bill. 
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