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Originally Posted by Gargamel
I believe their hulls are titanium. I work with Ti every day at temps over 1000f, and it's amazingly resilient. Stainless steel falls apart within months in this environment, while Ti still looks new. I would doubt this lower heat would have much affect on it. That said, it is a high performance pressure hull.
But think of the crew stuck inside. Wonder how quickly the "Hot in here?" joke got old.
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Not all hulls are titanium. It's really expensive to manufacture and use. IIRC only the Alfa was an all-titanium hull (mostly because they thought it'd help with MAD), and I think Typhoons use it as well (mostly because they thought it'd stand up to the ice) though it's used in varying degrees in other subs.