The key answer of exercise Speaking

The lift-off had some minor problems but nothing serious. Then, two days later, a short circuit caused an oxygen tank to explode. The crew contacted us and told us they had a problem. They acted quickly. They moved into the lunar module so they didn't run out of oxygen or power and used it as a lifeboat. They had to come up with a solution to keep the carbon dioxide levels down and then switch back to the command module for landing, but everything was fine. They proved that their training helped them to deal with problems in space. We are very proud of them.