Montecito is hit by a devastating natural disaster that leaves its residents fighting for their lives. Overnight, the quiet California beach town is swamped by a terrifying series of debris flows that destroys homes and leaves streets swimming in mud. Through eyewitness testimony and footage taken during the disaster, we reveal how split-second decisions made the difference between life and death.

The story of the largest wildfire in Portugal's history and how it devastated a rural community. As firefighters tried to control the blaze, fierce winds from a thunderstorm combined with the fire to make it unstoppable. Fleeing locals were caught in the inferno — many injured and killed. Through forensic analysis, we reveal how this event unfolded.

Nepal is hit by a 6.7 mega-earthquake that kills thousands. Across the country, survivors are hit by terrifying avalanches that destroy everything in their path. We reveal remarkable stories of survival, from the Kathmandu Valley to Mount Everest. We detail the split-second decisions that resulted in life or death, from those who were there and through footage recorded during the tragedy.