 Some point in the not too distant future, a mining/research colony is set up one of Jupiter s moons, Io. All s ok, until a major earthquake (or what ever the Io equivalent is) destroys the communication array and puts the colony in danger of falling down the side of a canyon. In a desperate bid to escape back to Earth, the colonist have to reactive an abandoned space station and use it to get back to earth. The event s that take place on the trip (malfunctioning computers, low food, and rogue weapons satellites to name but 3) test the colonist to the limit.