Transcription: walls. Now we're inside one of the original 50 feet diameter diversionary tunnels and we're standing right on top of four 30 feet diameter pin stocks. They feed these 13 feet diameter feeder pin stocks. Right as you get here in 1931 that was to build these four diversionary tunnels. This is the diversionary tunnel we're in right here. They line the tunnels over three feet of concrete. you
(.mp4)