Nobody Has Reached the Bottom of This Blue Hole
About this video
In December 2023 a research team lowered a profiler into Taam Ja', a flooded shaft in a shallow bay on the Mexico–Belize border. It passed 420 metres below sea level and reached the limit of the equipment without touching the floor — making it the deepest blue hole ever measured, and the depth on record is a measurement of our cable, not of the hole. The water below 400 metres is stranger still: its temperature and salinity read less like the brackish bay above it and more like the open Caribbean, which points to submerged limestone passages connecting the shaft sideways to a sea it does not touch on any map. The column is stratified and runs out of oxygen long before it runs out of depth. Three possibilities remain open for what lies below 420 metres — a floor just out of reach, a shaft that continues far deeper, or a network of drowned galleries in which "depth" stops being the right question. Chapters 00:00 A probe that never hit bottom 01:00 How deep is deep 02:20 Land features that drowned 04:00 The December 2023 descent 05:20 Three waters in one shaft 07:00 What is under 420 metres Sources: Frontiers in Marine Science (2023, 2024) blue-hole surveys of Taam Ja'. Educational content. Values and depths are stated as measured and date-stamped; where the science is unsettled we say so.
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