Third anicdote; titanium is pretty expensive stuff. Online metals is selling a 3&quot;x12&quot;x12&quot; piece for $1.7k. If your hull was 200&#x27; long, 15&#x27; in diameter you&#x27;d need $486M just for the raw titanium on the hull. That seems high just for the hull, even for a nuclear sub. Google is saying the whole thing is probably about $2B and I&#x27;d expect all the other stuff in there to cost a lot.