Think that your cloud backup, off-site hard copies, and RAID setup will keep your photo collection safe? Well, probably. But some folks go to more extreme measures to preserve their archives.

Underground, a 16-minute documentary by the Carnegie Museum of Art, takes a look at the Bettman Archive, owned by Corbis Images. It’s a collection of more than 11 million photos, housed in a climate-controlled environment under a mountain in Pennsylvania.

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