World's Largest Cave Explored by Drone

See amazing footage from a drone fly-through of the Hang Son Doong cave in Vietnam, the largest in the world.

The Hang Son Doong cave in Vietnam is so massive the Empire State Building could fit inside. It's about 3 miles long and 660 feet at its deepest point. Recently Beijing based photographer Ryan Deboodt used a drone and a GoPro camera to get a view inside and above the cave. Check out the video below.

An underground river river eroded massive amounts of limestone from underneath a mountain, which collapsed creating massive skylights. The cave was named the largest in the world after a 2009 expedition to survey it by the British Cave Research Association.