Secrets of the Underground — Season 1, Episode 6: California's Hidden Doomsday
Reality, Documentary • 60 min • 2 seasons, 16 episodes • ★ 5.5/10
Episode synopsis
Rob Nelson heads to California to investigate a network for major fault lines that could set off an unprecedented mega-quake. Then, he explores a mysterious sinkhole that some believe is an endless pit to the center of the Earth.
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.