Duration
60 minutes
Series Info
Season 1 Episode 6 of 8
Quick Summary
Rob Nelson investigates a potentially disastrous fault-line network in California
About This Program
Rob Nelson heads to California to investigate a network for major fault lines that could set off a mega-quake. Plus, he explores a mysterious sinkhole
Secrets Underground broadcasts on Discovery History +1 at 10:00pm, Monday, 22 December 2025. (Subtitles)
Channel Numbers:
Sky HD782Sky274Virgin381
Production Details
Runtime60 mins
