Ex-army explosives technician, Eli Kingston, was recently arrested after destroying several important buildings (he also does hits). He is put into a maximum security prison on an artificial island. The cell that he is put in is underground and has three groups of guards that never leave the area.
Recently there have been new guards added at the prison. They are either clones or robots. None of them are put downstairs with Eli.
Anyhow, what ends up happening is that the clones/robots make all the other guards work with them and they start killing the prisoners. As you guessed it, Eli, his fellow prisoners and the guards with them are the only resistance. They eventually destroy the island prison and escape. From then on, tehy move around to other prisons, destroying the clones/robots.