Secrets of the Underground — Season 1, Episode 3: America's Buried Massacre
Reality, Documentary • 60 min • 2 seasons, 16 episodes • ★ 5.5/10
Episode synopsis
Rob Nelson hunts for a legendary mass grave that could expose a dark secret of America's industrial past. High in the mountains, a giant lake is mysteriously disappearing, and Rob uses cutting-edge technology to find out why.
About Secrets of the Underground
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.