Why is no one addressing my very valid concern? Or am I just a big pussy?
The tunnels?
It's just a mind game. Think of it like Fear Factor. Just need to block it in your mind and do it. Close your eyes and have your partner/team guide you if you have to, it will be over in 60 seconds.
It's an all rounded course that is supposed to challenge everyone. I imagine there is at least one section that is a major "fear" for most people, be it tight spaces, trapped under water, electric shock, fire, heights, etc.
Like I said above, things like this are 90% mental and are designed that way on purpose.
Your concern with being "stuck" is an illogical part of the claustrophobia. Everyone's goal is to finish, there will be a constant flow at all times. Nobody is going to want to stop and stay "stuck" in there any longer than you do. Attack phobias with logic.
If it helps, remind yourself that there are staff, medical personel, and lots of people around you at all times. It's not like you're stuck in a cave in the wilderness by yourself left to die or anything. The whole thing is only 3 hours. Three lousy hours, then it's done, over.
My only real fear? Failure. But I have 8 months to resolve the only possible cause of failure.