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Their bunker, an astonishingly constructed salt mine, has a house, individual rooms, a swimming pool, a fishery and just about anything else you’d need in the aftermath of an ecoapocalypse.

But they warm to each other enough to sing their own duet, running through the salt mine with their arms stretched wide.

Much of the choreography was figured out on set, often in a real salt mine.

The Monuments Men and Women Gallery includes a recreation of a salt mine where monuments officers found stolen art.

PHOTOS: Petrochemical giant's salt mine ruptures in northeastern Brazil.