I dont' do subterranean very well. And Im curious on taking this train from London to Paris on an upcoming trip.

So how long are you physically submerged in the tube. Under the water? I guess im worrying about having a bit of an anxiety attack. If it's an hour, I dont think I could do it. If it's 15 mins, that's doable. lol

edited to say: I know this might be amusing to some people, but some of us do have odd anxieties such as being underground, or in tunnels or hurling thru an aluminum tube at 600 mph. (That one I dont have any worries about )