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Originally Posted by Doc Savage
I thought the Astute's hull looked slightly odd (somewhat fatter) but had put it down to the angle of the photos.
Funny how there are so many different hull designs for subs.
Logically, one would think, a cylindrical hull would be better at distributing pressure evenly over the hull.
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Don't confuse the shape of the PRESSURE hull with the shape of the outer hull.
You can have a cylindrical pressure hull and the put a rectangular box around it if you want. USN subs do not have an outer hull on them. What you see IS the pressure hull. Many other navies put fairings and such for their own purposes and designs. Ballast tanks, array fairings, the differences in mounting the fairwater planes are all things that can affect the external appearance.