This massive underwater volcanic tunnel features lava caves, lakes, a concert hall, and a fascinating blend of subterranean ...

With high carbon dioxide, low oxygen and no photosynthesis, here’s how an entire ecosystem persists in Movile Cave, one of the most extreme environments on Earth.

Deep in the rugged mountains of Papua, Indonesia, one of the most astonishing mining operations on Earth continues to shape ...

Join us on an epic adventure as we explore one of the biggest mines we've ever seen—complete with towering 70-foot ceilings and endless tunnels! As we navigate the maze-like passages, we stumble upon ...

Czech researchers working in Albania discovered the largest underground thermal lake in the world. Screengrab from the Neuron Foundation's Facebook page In 2021, a group of Czech scientists set out on ...

Veryovkina Cave reveals more mysteries the deeper you go. Here’s everything that makes this cave a ... [+] world of its own ... Many who ventured inside barely made it out.

Before the Lærdal Tunnel was built, travelling between Oslo, Norway's capital, and Bergen - its second-largest ... the world's longest road tunnel. The distinctive lighting and cave-like rest ...

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 ...

Would Trump risk reducing the U.S. influence in the World Bank by decreasing its shareholding? Plus, a glimpse at the dark ...