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February 23, 2026

SCIENTISTS SHOCKED BY DISCOVERY OF WORLD'S LARGEST BLUE HOLE: "We have no idea what's at the bottom"

The world's deepest blue hole is located just off the coast of Mexico.

SCIENTISTS SHOCKED BY DISCOVERY OF WORLD'S LARGEST BLUE HOLE: "We have no idea what's at the bottom"

TL;DR

  • The deepest blue hole in the world, Taam Ja' ("deep water" in Mayan), is located off the coast of Mexico's Yucatan Peninsula.
  • Its depth exceeds 420 meters, and researchers have not yet reached its bottom.
  • Initial sonar measurements in 2021 suggested a depth of 275 meters, but a 2023 expedition using a CTD profiler indicated a greater depth.
  • Blue holes are natural vertical caves on the seabed, typically found in coastal regions due to limestone erosion.
  • They have poor water circulation and low oxygen levels, making them inhospitable to most life forms except microbes.
  • The Great Blue Hole in Belize is another well-known example, explored by Richard Branson and Fabien Cousteau.
  • The formation of blue holes is linked to rising sea levels, as they were once land-based cave systems.
  • Explorations of other blue holes have found hydrogen sulfide layers and even human debris.

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