Inside the 2005 La Conchita Landslide: Dry Debris, Hidden Water Pressure, Killer Flows

A hillside collapses in seconds — but the mud isn’t what you think. Why was La Conchita’s deadly 2005 slide so fast when the debris looked dry? Naked Science follows geology detectives as they trace a hidden plumbing system inside Southern California’s weak coastal hills, revealing how trapped water pressure — not weight or lubrication — can turn a slope into a battering ram. Then the story widens: a Yosemite rockfall that flattened forests with an air blast, a 53-hour survival at Thredbo after a sodden slide, and volcanic lahars that race like wet concrete. Scientists debate a potential mega-tsunami from La Palma while engineers battle gravity with USGS flumes and Swiss rockfall nets. Discover the friction-loss trick that unlocks fast slides, the fault-gouge “grout” that bottles up water, and why some disasters are natural while others are tragically man-made. Watch to see how close we are to predicting the next move — and what, if anything, can truly keep us safe. Watch now to learn what really triggers slides, falls, and flows — and why water is always at the scene of the crime. #Landslides #Geology #LaConchita #Yosemite #Thredbo #Lahar #NakedScience #Documentary