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upstart [soylentnews.org] writes in with an IRC submission for guy_:

No One Knows What Lurks at the Bottom of This Freakishly Deep Submerged Cave [gizmodo.com]:

New research suggests Hranice Abyss—the world’s deepest freshwater cave—is around 0.6 miles (1 kilometer) deep, which is more than twice the depth of previous estimates.

Journal Reference:
Radek Klanica, Jaroslav Kadlec, Petr Tábořík, et al. Hypogenic Versus Epigenic Origin of Deep Underwater Caves Illustrated by the Hranice Abyss (Czech Republic), Journal of Geophysical Research: Earth Surface (DOI: 10.1029/2020JF005663 [doi.org])

Original Submission