Sy Liebergot: Flight... I recommend we shut down reactant valves to the fuel cells.
Gene Kranz: What the hell good is that gonna do?
Sy Liebergot: If that's where the leak is, we can isolate it. We can save what's left in the tanks and we can run on the good cell.
Gene Kranz: You close 'em, you can't open 'em again! You can't land on the moon with one healthy fuel cell!