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The long and short of it

The long and short of it

Explorers stop in front of a rock wall near the exit of En.

En Cave's roof comes in as the explorers go further inside.

Explorers stand on rocks inside En Cave which is under 100 meters of water during the monsoons.

Trees have grown after the roof of a cave collapsed, allowing more sunshine.

An explorer climbs down Loong Con Cave. Water evaporates inside the cave and forms clouds.

Ken can only be accessed between November and April since it is flooded due to rain during the rest of the time.

Another NatGeo photo shows two explorers swim inside Ken, one of 20 caves discovered in Vietnam last year.

A wall made of stalactites some 60 meters tall inside Son Doong. It was another obstacle for British explorers who discovered the cave in 2009.

Sunshine makes its way into Son Doong Cave.

Fungus-covered rocks at the entrance of Son Dong are a challenge to explorers.

Son Doong, in a National Geographic photo, has enough space for a 40-story building.

Explorers stop in front of a rock wall near the exit of En.
En Cave's roof comes in as the explorers go further inside.
Explorers stand on rocks inside En Cave which is under 100 meters of water during the monsoons.
Trees have grown after the roof of a cave collapsed, allowing more sunshine.
An explorer climbs down Loong Con Cave. Water evaporates inside the cave and forms clouds.
Ken can only be accessed between November and April since it is flooded due to rain during the rest of the time.
Another NatGeo photo shows two explorers swim inside Ken, one of 20 caves discovered in Vietnam last year.
A wall made of stalactites some 60 meters tall inside Son Doong. It was another obstacle for British explorers who discovered the cave in 2009.
Sunshine makes its way into Son Doong Cave.
Fungus-covered rocks at the entrance of Son Dong are a challenge to explorers.
Son Doong, in a National Geographic photo, has enough space for a 40-story building.