You have chosen to ignore the warnings, and enter the tunnel.
You walk down the tunnel. As you get deeper, it gets darker, and darker, and darker. (Luckily, you have your night vision goggles!) After a few minutes of walking, you hear a loud crash. You turn around, and realize that the tunnel has caved in! You look around for another way out. Suddenly, Herbert enters the tunnel; he starts laughing maniacally; the tunnel starts to shake; and then you feel a sharp pain on the top of your head. You fall over unconscious. Continue.