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The explosion At first the crew thought a meteoroid had hit them. As well as the noise of an explosion, the electrics were going haywire and the attitude control thrusters had fired. In fact, a short circuit had ignited some insulation in the Number 2 oxygen tank of the Service Module. The Service Module provided life support, power and other systems to the Command Module, which held the astronauts as they travelled to and from lunar orbit. The Lunar Module was a separate, though connected, craft that would be used to ferry the men to the lunar surface and back. The fire caused a surge in pressure that ruptured the tank, flooding the fuel cell bay with gaseous oxygen. This surge blew the bolts holding on the outer panel, which tore off free and spun into space, damaging a communications antenna. Contact with Earth was lost for 1.8 seconds, until the system automatically switched to another antenna. The shock also ruptured a line from the Number 1 oxygen tank. Two hours later all of the Service Module’s oxygen supply had leaked into the void. As the Command Module’s fuel cells used oxygen with hydrogen to generate electricity, it could now only run on battery power. The crew had no option but to shut down the Command Module completely and move into the Lunar Module. They would then use this as a ‘lifeboat’ for the journey back to Earth before rejoining the Command Module for re-entry. As for the mission, the Service Module was so badly damaged that a safe return from a lunar landing was impossible. These men would not be landing on the Moon. 320,000 km from home The Flight Director immediately aborted the mission. Now he just had to get the men home. The quickest way would be a Direct Abort trajectory, using the Service Module engine to essentially reverse the craft. But it was too late:
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Collins Maps (Extreme Survivors: 60 of the World’s Most Extreme Survival Stories)