Carlsbad Caverns National Park in New Mexico sent cavers to bottom of a “Bottomless Pit” to look for trash thrown in by tourists. They found $14.36 in change.
Here's what was at bottom of New Mexico's 'Bottomless Pit
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Bottomless Lakes State Park - State Parks
The Bottomless Pit - Picture of Bottomless Pit, Carlsbad Caverns National Park - Tripadvisor
Approaching the bottomless Pit - Picture of Bottomless Pit, Carlsbad Caverns National Park - Tripadvisor
Focus Regional Winter 2021 Legends & Science of Bottomless Pits, Bogs, & Lakes - Focus NM Daily
Bottomless Pit (Carlsbad Caverns National Park, New Mexico…
How four young divers found no way out of a 'bottomless' hole and drowned in darkness - Daily Star
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Pecos Slope Groundwater
Geologic Tour: Bottomless Lakes State Park