[The sky above them, the weather, it's all artificially generated. Which puts any any instances of dangerous or weird weather in a strange context if you think about it for too long, so let's not for now.]

A really inhospitable environment, basically? [To sum it up succinctly.] Breathing in too much of the air from outside makes people sick, and there are some dangerous looking creatures lurking around out there.

There were a few offworlders who got permission and equipment to explore outside a while back, though. Shared some video footage of it, too, if you wanted to see.

[It would be very easy to just pull it up on his communicator, no sweat!]