El túnel de los huesos (2011)

Seven prisoners dug a tunnel to escape from prison. They had to deal not only with troubles from prison guards and other prisoners, but also with infighting among seven people. They dug up something ominous in the tunnel: human bones-proof of the Dark Ages in Argentina. In a moment of despair, these outlaws signed a contract with the dead: as long as they can get out alive, they will tell the truth.