query: How many died in the Columbia crash?
passage: Space Shuttle Columbia disaster
On February 1, 2003, the Space Shuttle Columbia disintegrated upon reentering Earth's atmosphere, killing all seven crew members. The disaster was the second fatal accident in the Space Shuttle program after Space Shuttle Challenger, which broke apart and killed the seven-member crew 73 seconds after liftoff in 1986.
passage: Space Shuttle Columbia disaster
Following protocols established after the loss of Challenger, an independent investigating board was created immediately after the accident. The Columbia Accident Investigation Board, or CAIB, was chaired by retired US Navy Admiral Harold W. Gehman, Jr.,[54] and consisted of expert military and civilian analysts who investigated the accident in detail.