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January 28th, 1986, one ofthe worst accidents in spaceflight-history happened, when Space Shuttle Challenger exploded 73 seconds after liftoff into mission STS-51L, affecting the loss of all 7 crew members and the vehicule. Available are a radio communication transcript (official script by NASA) which begins at T-2:05 and ends at T+1:13, the moment of the Shuttle breakup.
Click on the STS-51L-Symbols to have access to the data
Official NASA data about the accident