No, the navy would not publish this. I will dig up a submersible website that has some of this. But the "birdy" would peck out my eyes if i told you the source. Also try googling "Alumina Ceramic hulls" and see what you get. My gues is that maybe they would use it for an new NR project or possibly a torpedo that can make 4000 feet without imploding. US Navy could have made Titanium alloy subs but deemed it un-necessary, but if the Russians or someone else like China ever does then the simple solution is having a torpedo that can make those depths. Having a combat submarine with a titanium hull then becomes a moot point.
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