Answer
The Apollo 1 tragedy occurred during a simulated launch rehearsal test on January 27, 1967, at the Kennedy Space Center, Florida. A fire erupted within the Apollo 1 command module during this test, which was fueled by pure oxygen. Despite valiant efforts to extinguish the flames, astronauts Virgil "Gus" Grissom, Edward White, and Roger Chaffee lost their lives in the tragedy.