This story appears in the March 2019 issue of National Geographic magazine.
This content is Subscriber-Exclusive
You must have a National Geographic subscription to explore this article.
Step inside this massive cave labyrinth hidden under Borneo
Beneath the island’s rainforest, explorers search for new discoveries deep within some of the Earth’s largest, longest, and wildest caves.
At dusk, a swarm of bats disperses to hunt in the rainforest surrounding Deer Cave. One of the planet’s largest underground passages, it holds more than two million bats.
Read This Next
Go Further
Animals
- How can you tell if a wild animal really needs your help?How can you tell if a wild animal really needs your help?
- Fireflies are vanishing—but you can help protect themFireflies are vanishing—but you can help protect them
- Could this simple plan save Africa's most mysterious cat?Could this simple plan save Africa's most mysterious cat?
- This ray is vanishing from our oceans—and being made into jewelryThis ray is vanishing from our oceans—and being made into jewelry
- Why 4 dead California sea otters have scientists so alarmedWhy 4 dead California sea otters have scientists so alarmed
- SeaWorld allegedly violated the Animal Welfare Act. Why is it still open?SeaWorld allegedly violated the Animal Welfare Act. Why is it still open?
Environment
- Seaweed may play a big role in the fight against climate changeSeaweed may play a big role in the fight against climate change
- Is banning fishing bad for fishermen? Not in this marine reserveIs banning fishing bad for fishermen? Not in this marine reserve
- Dust storms are getting worse—here’s why they’re so destructiveDust storms are getting worse—here’s why they’re so destructive
- Japan poised to release nuclear wastewater into the PacificJapan poised to release nuclear wastewater into the Pacific
History & Culture
- From police raids to pop culture: The history of modern dragFrom police raids to pop culture: The history of modern drag
- How the Stonewall uprising ignited the pride movementHow the Stonewall uprising ignited the pride movement
- They were seeking a mythical oasis—and found a Stone Age surpriseThey were seeking a mythical oasis—and found a Stone Age surprise
- Why do we celebrate Memorial Day? A brief history of the holidayWhy do we celebrate Memorial Day? A brief history of the holiday
Science
- At 64, Diana Nyad swam from Cuba to Florida. How'd she do it?At 64, Diana Nyad swam from Cuba to Florida. How'd she do it?
- A ‘kitten-otter-bear’? Identifying a very strange skeletonA ‘kitten-otter-bear’? Identifying a very strange skeleton
- Fossils reveal predator's struggle to survive mass extinctionFossils reveal predator's struggle to survive mass extinction
- You can't detox your uterus—debunking popular myths about PCOSYou can't detox your uterus—debunking popular myths about PCOS
Travel
- How bison have been brought back from the brink in SaskatchewanHow bison have been brought back from the brink in Saskatchewan
- A summer guide to Lisbon, from street art to hilltop lookoutsA summer guide to Lisbon, from street art to hilltop lookouts
- 5 unmissable foods that unlock Jordan’s culinary scene
- Paid Content for Advertiser
5 unmissable foods that unlock Jordan’s culinary scene