This is what a Hoover Dam spillway tunnel looks like. Check out the tiny, tiny walkway on top:
The spillways are there to make sure water doesn't go over the dam. The tunnel is 50 feet wide and 600 feet long and totally not the stuff of nightmares.
nah just doesn't like to obey the ccp, and will most likely end up in a re education camp
Saalburg Museum, Bad Homburg, Hesse, Germany.