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World's Largest Cave Explored by Drone

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.

The biggest cavern in Vietnam's Son Doong Cave is so vast that it could accommodate a Boeing 747. “You feel absolutely miniscule,” says Ryan Deboodt, a professional photographer whose video of the cave went viral this week. Deboodt spent eight days camped inside the cave, one of the world's largest, with a GoPro fitted onto a drone.

First explored in 2009, Son Doong Cave is located in Phong Nha-Ke Bang National Park in central Vietnam. Deboodt's video takes viewers on a flight through its massive caverns, some of which are almost 500 feet (150 meters) wide and 650 feet (200 meters) high. (Read about an expedition to the end of Son Doong.)

This interview has been edited and condensed. Follow Ralph Martins on Twitter.

Your film really captures the enormous scale of the cave. How did you do that?

It was just being sure to have people in the shots—without people you just don’t really know. It’s just having the people down low. It’s sometimes difficult to even see them, but when you do, it makes it that much bigger. You realize, “Oh, wow, that’s somebody tiny right there.”

You used a quadcopter to get the footage. What exactly is that?

It’s a remote-controlled helicopter with four rotors, and there’s a GoPro on the bottom.

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Does it take a lot of practice to keep under control?

Inside the caves there’s no GPS, so it’s flown on manual, and it takes a bit more to make sure it doesn’t run into anything. [Laughs] You can actually get quite strong drafts—when clouds are forming inside the cave, the drafts are so strong that you can see them blow a cloud through.

What lives inside the cave?

Under the skylights, you have spiders, you have birds, you have all kinds of bugs and snakes. In the dark parts of the cave, you have species of fish and a translucent wood louse, which have evolved to no longer have pigments because they’re in darkness all the time.  

The [trees] are tall and very skinny because they’re reaching up for the light. So they don’t grow very wide; they just grow up and up.


Since the cave is in a national park, is it pretty well protected?

There’s still a bit of deforestation in the park, and the Bru-Vân Kiều [an ethnic group that lives in the park] still depend on [the land for farming]. But I’m fully on the conservation side. That’s one of the things I wanted to do with this video: to show how beautiful it is, and how it should be protected.

You’ve done a lot of photography with caves. What is it about them that inspires you?

For me, caves are one of the last unexplored places in the world. It’s that draw of exploration, of being somewhere no one else has been, seeing things that no one else has seen.

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