Duration
60 minutes
Series Info
Season 3 Episode 20 of 24
Quick Summary
The truth about strange 'alien' deposits found on Earth's surface
About This Program
Geologists begin to ask questions about 'alien' deposits found on the Earth's surface - and the answer could shed light on the cause of history's greatest extinction event
Nasa's Unexplained Files broadcasts on Discovery History at 1:00pm, Wednesday, 24 December 2025. (Subtitles)
Channel Numbers:
Sky HD784Sky174Virgin181
Production Details
Runtime60 mins
