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The World’s 2nd Deepest Blue Hole, Taam Ja’, Was Discovered Off Mexico’s Yucatan Peninsula In 2021. It Measures ~900 Ft Deep And Spans 147,000 Square Ft. Taam Ja’ Lacks Oxygen And Sunlight But Supports Diverse Life Adapted To Low-Oxygen Conditions. It’s The 2nd, After The ~980 Ft China’s Dragon Hole. Blue Holes Are Underwater CaCO3 Cave Fm.

Researchers Discover Massive 900-Feet-Deep Blue Hole In Mexico

https://www.ndtv.com/science/researchers-discover-massive-900-feet-deep-blue-hole-in-mexico-3976740

Dubbed Taam ja’ – which means “deep water” in Maya, these blue hole has little oxygen and sunlight only shines on the surface.