He points out that they can trap heat in the winter, and, he says, the retrofits required for water recycling would not have to be very sophisticated.

T-Bag meets with Sucre and points out the operative to him, telling him he's walked into a trap.

In the reading books to find himself into the depths of the thing, the other all thrown away, the mind is to throw away so overburdened and will own all the points from the trap.