The vault was lifted ontoJuno's propulsionmodule on May19atLockheedMartin's high-baycleanroom. It will undergo furthertesting once the whole spacecraft is put together.
After an explosion in Apollo 13's service module cut off propulsion and power, the lunar excursion module (LEM) was used as a lifeboat to provide life support to the three astronauts, and the engine of its descent stage for course changes, until the command module could re-enter the atmosphere after a long coast around the moon.