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oilfield makes giant parts out of exotica all the time, aint cheap but I think that a 5 person 6000psi sub shouldent be cheaply built.
Mild or even normalish high strength steel isnt going to be very appealing since it will have to have a very thick wall and would need some sort of additional buoyancy. Titanium is compelling for the strength / weight /corrosion resistance.
Very high strength steel, stainless, or nickel alloys would probably work ok. It is basically statically loaded in pressure so you can use steel heat treated to within an inch of its life, but gotta watch corrosion. Maybe some 300ksi maraging steel
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84 930
18 Cayman GTS
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