Why it's incredible: The cave is the biggest in the world and contains two jungles. Hang Son Doong is the world's largest known cave, with enough space in some of its passages to fly a Boeing 747 ...

The cave was discovered in 1990 by Ho Khanh, a local resident, who stumbled upon it while hunting in the jungle. However, it wasn’t until 2009 that a team of British cave explorers, led by ...

I continue alone, following the beam of my headlamp along year-old footprints. A jungle inside a cave? A roof collapse long ago in Hang Son Doong let in light; plants thickly followed. As ...

Entering the jungle, Cerè switched his phone off ... a 200-foot barrier to be conquered by both ladder and rope climbing. In a cave there’s no way to get a signal. There’s no way to talk ...