You are uncomfortable any time you can’t see the sky – or at least a very high ceiling. In a small room or vehicle, you feel the walls closing in on you... You need air! This is a dangerous fear for someone who plans to go underground.
In any situation in which personal harm seems imminent, make a HT roll. Do not roll until the instant you need to fight, run, pull the trigger, or whatever. Any roll over 13 is a failure, even if you have HT 14+. On a success, you can act normally. On a failure, you are mentally stunned.
