How did a glacier collapse in Nepal trigger a devastating mudslide that struck Gyirong Port in southwest China's Xizang Autonomous Region? In just seven minutes, the disaster traveled 20 kilometers, dropping nearly 3,300 meters in elevation and reaching an average speed of 50 meters per second.

Watch this animation to see how the cross-border chain disaster unfolded — from the initial glacier collapse to the powerful mudslide that hit Gyirong Port and areas downstream.