อนุทิน 174490

Blue Holes on Earth

https://phys.org/news/2024-05-taam-ja-blue-hole-mexico.html –first discovered in 2021, and at the time, was believed to be approximately 275 meters deep. –That dive showed the Taam Ja’ Blue Hole is at least 420 meters deep, making it the deepest in the world. But it is actually deeper than that; the profiler they used was only capable of functioning at depths of 500 meters.

Blue holes are water-filled caverns that form below the seafloor. They are most often found in coastal areas where the bedrock is prone to erosion. They develop as ocean water seeps through cracks, dissolving minerals as they go, leading to sinkholes . Over time, they can grow quite large. Several blue holes have been found around the globe, such as the Great Blue Hole near Belize and the Dahab Blue Hole off the coast of Egypt. Up until now, the deepest known to exist was the Dragon Hole in the South China Sea, which has been measured to 301 meters.

Note Sinkholes are water-eroded caverns that form below ground surface. They are hidden until the [earth] domes collapse.

ถ้ำน้ำบ่อผี แม่ฮ่องสอน (The Spirit Well Cave, “Tham Nam Bo Phi”), is Lahu people’s spirit cave. It is considered the biggest and deepest sinkhole in Thailand with the size as big as 2 football fields, 140 m deep, and a famous tourist attraction.