In April 1970, three astronauts aboard Apollo 13 launched into space on a mission to explore the surface of the moon. But that mission was never completed. As they began the routine procedure for landing the spacecraft on the lunar surface there was an explosion. Astronaut Jim Lovell radioed Mission Control with the now famous words, "Houston, we have a problem". All over the world, people followed the plight of the astronauts and their race against time.