As part of the presentation of the movie at NASA, the director was asked about the sturdy, bunker-like design for the base. The director explained that he thought that astronauts would build the base using material dug out of the moon itself, instead of bringing a habitat with them and placing it on the surface. As it happened, one of the other audience members was working on mooncrete, which as she explained to the director is a concrete-like material that could be made out of rocky regolith on the lunar surface.