Russian prisons are very difficult, but there is one that is even more difficult than the rest.
Dubbed Black Dolphin, this high-security prison on the border with Kazakhstan houses the country's most brutal criminals, including serial killers, cannibals and terrorists.
"The only way to escape from this hell is by dying," says one of the lieutenants of the infamous prison.
The name 'Black Dolphin' was taken from a black wooden dolphin, built by the prisoners, at the entrance of the building.
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