Roaring walls of water, collapsing skylines, Category 5 hurricane winds, and the harrowing, unfiltered footage captured by the people who survived to tell the tale. Welcome to Global Disasters | Witness to Disaster MEGA Episode | National Geographic. In this feature-length documentary compilation and scientific retrospective from National Geographic, leading geologists, meteorologists, and disaster response experts examine Earth’s most violent natural catastrophes through the eyes, cameras, and harrowing accounts of direct eyewitnesses.
