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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.

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.

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.