What would you do if your spaceship broke 200,000 miles from Earth? On April 11, 1970, three astronauts launched toward the Moon aboard Apollo 13. Two days later, everything changed. An oxygen tank on the spacecraft exploded. The blast damaged the ship's power and air supply. Commander Jim Lovell radioed the famous words. "Houston, we've had a problem." The astronauts could not land on the Moon anymore. They had to focus on getting home alive. They moved into the Lunar Module, a small craft designed to land on the Moon. It became their lifeboat. The ship had no heat, and temperatures dropped near freezing. Water was rationed to just six ounces per person each day. One dangerous problem was carbon dioxide building up in the air. The filters in the Lunar Module were the wrong shape. Engineers on the ground built a fix using cardboard, plastic bags, and duct tape. They radioed the instructions to the crew. The astronauts built the device and it worked. The crew navigated around the Moon and used its gravity to sling them back toward Earth. Four days after the explosion, Apollo 13 splashed down safely in the Pacific Ocean. NASA called it a "successful failure" because the crew survived against incredible odds.