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Now locked up in a Panamanian prison known as Sona, Michael, T-Bag, Bellick, and Mahone try to find a way out. Much to their devastation, they soon find out that the prison has been abandoned by the authorities because of the immense threat from the vile inmates. Michael seeks for an inmate named Whistler in the prison sewers. As Lincoln is puzzled by Sara's sudden disappearance, he learns that LJ has gotten into some trouble. He also tries to recover the 5 million dollars.