But we did keep our part of the bargain: the guerrilla who had led us to the underground prison was set free.

By taunting us with inaudible announcements in an underground prison!

That was the purpose for the underground prison.

What would the wardens think of the underground prison?

We were once more cut off from reality in our underground prison.

Why can't oil and gas escape from their underground prison?

He knew only that it was blocking his sole path out of this underground prison.

And as the last of the sun dropped behind the duplication machine, they returned to their underground prison.

Discovering Gordon's absence and a newly opened door, the four head into the basement which leads to an underground prison.

Torres could care less about any damage they'd done to this underground prison.