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100m is the number I have been considering. Not deep
enough to require materials more expensive than a516. In fact owning and
operating a submarine isn't really my main interest. My interest is in
building a replica diving boat. I like to build things. The boat will
mostly be optimized for travel on the surface. That said, collision and
corrosion damage are my greatest concerns. The way it is looking, I will be
having to add a lot of weight if my hull is simply strong enough for the depths
I wish. My interest in the navy steels is contingent on them being not more than
twice that of the a516 grade 70 and the a588 (which was about 1/3 more)
that I have already priced with a fabricator.
Gordon Alexander
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