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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Luck is a residue of Design.
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