We set out to explore one of the largest caves ever discovered – and the scale was beyond anything we imagined. In this video, we take you deep inside massive chambers, underground rivers, and surreal ...

The Extremes crew had trekked for two days through steep valleys covered in lush jungle to reach Hang son Doong cave. Set deep inside ... around 200 metres beneath the Earth’s surface.

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

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 ...

Hang son Doong, Vietnam, one of the largest caves on Earth. It is a portal to an extreme world, two hundred metres deep underground. Plants can only survive in this spot because light streams ...

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...