200,000 miles from Earth, the crew of the third manned mission to the Moon faced an astronaut's worst nightmare: an explosion on the spacecraft. It's what happened in the Oscar-winning film Apollo 13, but it's also a true story.
The lift-off of Apollo 13 took place on 11th April 1970. Two days into the mission, the three-man crew were in big trouble. They had been carrying out routine checks when there was a loud bang. Warning lights were starting to flash. Looking out into space, they could see a trail of gas — the spacecraft was leaking oxygen. They sent out a short message to the scientists back on Earth: “Houston, we've had a problem here.” At first, they thought that a meteor（流星）had hit them, but they later found out that a short circuit（短路）had caused an oxygen container to explode. Whatever the cause, they knew there was no time to lose. Their electricity supply in the command module（指令舱）depended on that oxygen and pretty soon they would run out of both.
The only solution was to move into the lunar module — the section of the spacecraft that would have landed on the Moon. Now though, they were using it as a kind of lifeboat. With its own power supply, oxygen and water, the three men could survive in the lunar module and return to Earth. There was another problem though. In an enclosed space like a lunar module, the carbon dioxide the crew was breathing out was dangerous. The equipment to clear the air of carbon dioxide was only built for two people. Now it had to deal with three. Amazingly, the crew managed to build an adapter out of materials onboard to reduce the carbon dioxide to a safe level.
There was one final obstacle. The lunar module wasn't strong enough to reenter Earth's atmosphere so the crew had to go back into the damaged command module. To everyone's relief, the crew of Apollo 13 arrived safely in the South Pacific Ocean on April 17th. Although the crew didn't land on the Moon, NASA still considered the mission a success.
