It has been 25 years since the ore spaceship Siberia was last heard from. Unfortunately, it is now on a collision course with the communications station Comstat 5 which is orbiting Mars. After one successful maneuver to avoid the Siberia, it rams Comstat 5 and the crew soon finds that the Siberia crew is dead and the reason that it has been missing for 25 years. But that reason is... see more