An oxygen tank exploded causing the astronauts to have lack of power, lack of water, lack of food, not much removal of carbon dioxide, and discomfort. They had a good few days before the explosion. They didn't know how they would get home without any power, but Flight Control helped them and they landed safely in the Pacific Ocean, fine, but they lost 31 pounds together total!
Commander; James A. Lovell
Commander Module Pilot: T. Kenneth Mattingly II
Lunar Module PIlot: Fred W. Haise Jr.