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Apollo 13's React Valve Leak
Apollo 13 has three fuel cells. Two of them are no longer producing electricity. To mission control, it's akin to amputating limbs in the bid to save their patient. The lunar module or LEM was only ever designed for the short trip from orbit around the moon down to the surface. It's barely fit for purpose but is all they've got. This is as close to a leap of faith as NASA will ever make.