One such drop is known as Fantastic Pit within Ellison’s Cave. It is the deepest freefall pit in America, plunging down vertically for 179 meters (586 feet). Within the same system is Incredible ...

the second deepest cave in North America. He’s the president of the Cave Conservancy of Hawaii, a nonprofit trust that has been buying up land in and around Ocean View to preserve the tunnels ...

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 ...