Inside Russia’s brutal Black Dolphin prison where the only way to escape is dying

A glimpse into a high-security Russian prison housing serial killers and cannibals reveals inmates that are watched around the clock and blindfolded when they leave their cell.

The high-security Black Dolphin prison houses the country’s most brutal criminals including serial killers, cannibals and terrorists.

It is home to around 700 inmates who together have killed around 3,500 people - that’s a horrifying average of five murders per inmate.