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 ...

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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 ...