Sixteen minutes from landing, mission control lose contact with the crew. The fears of some Nasa engineers are coming true. Following the disaster, Nasa comes under pressure to give answers.

Nasa engineers spot a piece of debris striking the shuttle during launch. In space, the crew continue their mission, unaware of the concerns, but the clock is ticking to re-entry.

As Nasa prepares space shuttle Columbia for its 28th mission, excitement and trepidation build amongst the astronauts and their families. But a month before they are due to launch, Nasa grounds its entire shuttle fleet when cracks are discovered in the fuel lines.