The Jails of Tartarus were the prisons of the souls of the damned. After Kratos was defeated by Charon and thrown into Tartarus, he awoke and found himself chained there. He then broke free of his shackles and found a way out. The whole area was filled with shackles and chains, and many other Prisoners could be seen chained to the walls. After the prison, Kratos ended up in the Temple of the Gods which lead to the Crypt and the Shackles of the Titans.