20 Extreme Adventures For Spelunkers and Cavers

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Underneath your feet, deep in the Earth, the planet’s final frontier awaits. Only the most adventurous dare to step away from tourist trap caves and explore the often muddy and fragile ecosystem found underground. Caving requires equipment and technique. Diggers wiggle into suffocating tight spaces to widen the entrance while other cavers climb, or descend, playing…

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