Secrets of the Underground

American Stonehenge (1x8)

Season finale

Air date: Apr 04, 2017

Rob Nelson uses state-of-the-art technology to search for rumored escape tunnels deep beneath Alcatraz. Also, a mysterious pattern of rocks is investigated at the bottom of Lake Michigan.

Rank #14061

Premiered: Feb 2017
Episodes: 16
Followers: 7

Ended
Science Channel
Tuesday