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Steel doesn't last forever. (The caretakers of various WWII-vintage preserved warships are finding that out the hard way even as we speak.) There's a real danger that, even if the scrappers don't get them, ships like the Savannah and the United States may simply fall apart eventually. Unless somebody is prepared to pour several billion dollars into the surviving fleet of historic steel ships, and to continue spending millions per year on them in the future, our maritime heritage from the steel hull era won't survive a whole lot longer...........