Apollo 13 is a tragic story of three astronauts that almost died in space. But failure was not an option. The pilot was ordered to stir the oxygen tanks. There was a defect in oxygen tank 2. It caused an explosion which knocked an entire side of  the rocket. The heat shield and the batteries were damaged. They only had 20 amps left to run the reentry sequence. They exited reentry one and a half minutes late. It is considered NASA’s greatest achievement getting the Apollo 13 command module back home. It demonstrates great american ingenuity to get the successful failure back down to earth.