History.com: The Apollo Mission That Nearly Ended With a Mutiny in Space

There were arguments over food, helmets and spacesuits that required 30 minutes for astronauts to use the bathroom. By 1968, America's space program was on the brink. A launchpad fire at Cape Canaveral killed three astronauts as they were conducting tests in their space capsule in January 1967. After 20 months of congressional hearings, political fallout and a spacecraft redesign, three new astronauts prepared for a mission dubbed Apollo 7: Wally Schirra, Donn Eisele and Walter Cunningham.