[s4e9]: Greatness Achieved

The team must thread a sleeve through a pipe conducting Los Angeles's water supply to avoid drowning while they dig.

The emotional core of the episode follows Michael, Lincoln, Sucre, and Bellick as they attempt to tunnel through a massive water main to reach Scylla , the Company’s "black book". [S4E9] Greatness Achieved

When the support rod breaks and the water flow is about to be restored, Brad Bellick (Wade Williams) makes a surprising choice. Despite his history as a self-interested and often cruel prison guard at Fox River, Bellick stays inside the conduit to manually lift the pipe into place. The team must thread a sleeve through a