0Beneath the surface of the Moon there are lava tubes formed by ancient volcanoes, just like on Earth, only bigger - much bigger. A lunar lava tube can shelter a crew, a town or an entire city the size of Philadelphia. Commander Billy Nguyen is in charge of Moon Base One. Ninety-four crew members just moved into Tube Town. While trying to increase their odds of survival and set up the first rocket factory in space, unexpected visitors arrive. Space is hard.