January 28th, 1986, the worst accident 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.. I included 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

What happened to the STS-51l-crew after the shuttle breakup - nobody really knows, but read this....