10% of the us military budget could cover it (60 billion). There's the potential to use the volatiles there to make local enclosed atmosphere, we'd eventually h

10% of the us military budget could cover it (60 billion). There's the potential to use the volatiles there to make local enclosed atmosphere, we'd eventually have the ability to grow some food locally, but yes, it's probably going to cost 100 billion. There are plans to build in things like lava tubes to protect against gamma rays.