2003 - millions watch live as Columbia breaks up in the sky over Texas, killing all on board. NASA, loved ones and investigators share how an incredible journey ended in tragedy.

On February 1st, 2003, the Space Shuttle 'Columbia' breaks apart in the skies above Texas, USA, during re-entry. "The Space Shuttle That Fell to Earth", a new three-part BBC documentary, "provides a probing account of the disaster which not only examines what happened", but why. As one former Nasa chief engineer put it, the disaster "didn't have to happen". The astronauts' families and Nasa staff share personal stories of the launch, professional concerns, unfolding disaster and the ensuing fallout.—'BBC' & Britrick_c21