Columbia fell apart as it re-entered the Earth's atmosphere on 1 February 2003, killing its crew of seven astronauts.
Foam insulation had peeled off and hit a wing, breaking a heat shield.
A group of independent people have been investigating how that could have happened.
Now they say problems in the way Nasa is run were to blame.
'It could happen again'
Dr Logsden, one of the investigators, said Nasa hadn't learnt enough from the Challenger accident in 1986.
And Dr Roger Launius, who was a Nasa historian, said foam had been falling off the shuttle for years but it was ignored.
And they said if things didn't change there could be other accidents.
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