Here's what life is like inside Russia's toughest prison

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Russia's Toughest Prisons

Screenshot/National Geographic

Russian prisons are notoriously tough, but there's one that's even harder than the rest.

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Called Black Dolphin, this high security prison on the Kazakhstan border houses the country's most brutal criminals, including serial killers, cannibals, and terrorists, according to a documentary by National Geographic.

One prison lieutenant told National Geographic that the only way to escape is by dying.