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Mexico’s Sistema Ox Bel Ha Is Now The World’s Longest Underwater Cave System, Stretching 524+ Km (325 Miles), Longer Than The Grand Canyon. Near Tulum, It’s Been Explored Since 1998 Via Sinkholes. New Passages Reclaimed #1 From Sac Actun. Meanwhile, Vietnam’s Hang Son Doong Has The World’s Largest Cave Chamber, Big Enough For A Boeing 747.

https://www.sciencealert.com/the-worlds-longest-underwater-cave-is-even-longer-than-we-realized

The longest known underwater cave in the world is even longer than we thought.