Krubera Cave in the republic of Georgia is currently the deepest known cave, at 7,208 feet. But Dark Star, with so many areas still to survey, is a prime candidate to take over the title.

Two decades later, I organized a series of expeditions to investigate new deep caves, using dye traces in cave streams to probe Arabika’s potential depth. In 2001 a team led by Ukrainian Yuri ...

Veryovkina Cave, the deepest known cave on Earth, plunges a staggering 7,257 feet (2,212 meters) into the abyss, forming a vast, vertical chasm that remains untouched by sunlight. This ...