the fourteenth doctor; doctor who (doctorfun) wrote in the100,
Oh, you'll still have loads of walls to go through. But, the tunnel will minimise your time clawing. The emergency walls are twenty-one inches thick, and then you've still got the main doors to go through. Those would be... Twenty-five inches, I'd wager. If they've not changed it since the last time I popped over for a visit. Marvelous security measures in place! Loved the combination locks.