The Apollo Missions
Gus Grissom, Edward H. White, and Roger Chaffee flew the Apollo 1 mission. On the first test, a spark was created under Grissom's seat and since the module was pure oxygen, it blew up and killed all three of them in 30 seconds. The difference between the Lunar and Command module is that the Lunar module went to the moon and the Command module was just going to orbit the moon. It took 20 hours for Apollo 8 to orbit the moon 10 times.