Ghouls do not need air, they can eat and drink, but it's not required. Radiation however will rejuvenate them, with Glowing Ones basically having "Infinite Power"

And if memory serves they have the coordinates right, they just need some supplies from you and to help calm down their friend Christopher who has been aiding them under the faulty premise that he's a ghoul (He isn't, he's just a normal guy with low self-esteem and some trauma), but since he's not a ghoul he can't come.

The place they're going is a highly radioactive moon that they plan on colonizing, it's real, and that's actually why they're not bringing Christopher, as the radiation while nourishing to ghouls, would fry any human.

You can as a bad Karma option, convince Christopher to sabotage the mission, you can sabotage it yourself, you can make some improvements to their plan that makes it work better (which if you have low intelligence, will just lead to them crashing)