Because that means that we're actually trapped on some technicolor space rock, for one thing.

[He smooths a hand up the side of one cavern wall, fingers running over the crystal.]

And there's nothing here I'd say I recognize as 'man-made' as far as buildings or that kind of shit go. That means we're either a good ways away from civilization or there isn't a civilization to be far from.

[He waves a hand to the side.]

Either way, that's pretty fucking bleak. We'll probably die.