What would you build with only duct tape and cardboard to save your life? On April 11, 1970, three astronauts launched toward the Moon aboard Apollo 13. Two days into the flight, an oxygen tank exploded inside the spacecraft. The blast damaged the ship's power system and life support. The astronauts -- Jim Lovell, Jack Swigert, and Fred Haise -- were 200,000 miles from Earth with a broken ship. Mission Control in Houston had to figure out how to bring them home alive. The astronauts moved into the Lunar Module, a small section of the ship designed to land on the Moon. It was never built to support three people for four days, but it was their only option. Engineers on the ground had to solve one critical problem. The air filters in the Lunar Module were the wrong shape to fit the Command Module's filtration system. Carbon dioxide was building up inside the cabin. Using only materials the astronauts had on board. Cardboard, plastic bags, and duct tape -- engineers designed a makeshift air filter. They read the instructions to the astronauts step by step over the radio. It worked. On April 17, 1970, the astronauts splashed down safely in the Pacific Ocean. The mission never reached the Moon, but NASA called it a "successful failure" because everyone survived. Apollo 13 proved that creative problem-solving under pressure can overcome even the most dangerous situations.