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Hello,
Just read a little about the concrete ships of WWI and WWII, public opinion seems to have been a big driver in WWI for the lack of success.
Little note, "huge difference in vertical and horizontal compression forces. Metal hulls can deform without breaking. A concrete submarine will crack"
I'd say that will be a large part of the answer...
Steve
Ps. I like the idea of them becoming a rock on the seabed though, they would be tough buggers to find.
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