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Zacatón. Zacatón is a thermal water-filled sinkhole belonging to the Zacatón system - a group of unusual karst features located in Aldama Municipality near the Sierra de Tamaulipas in the northeastern state of Tamaulipas, Mexico. At a total depth of 339 meters (1,112 ft), it is one of the deepest known water-filled sinkholes in the world.
Sheck Exley (April 1, 1949 – April 6, 1994) was an American cave diver. He is widely regarded as one of the pioneers of cave diving, [1][2] and he wrote two major books on the subject: Basic Cave Diving: A Blueprint for Survival [3] and Caverns Measureless to Man. [4] On February 6, 1974, Exley became the first chairman of the Cave Diving ...
Sporobolus airoides is a perennial bunchgrass forming a clump of stems reaching up to 2 m (6.6 ft) tall. The stem bases are thick and tough, almost woody in texture. The fibrous green or gray-green leaves are up to 60 cm (24 in) in length. The inflorescence is long and generally wide open and spreading, bearing yellow spikelets with purplish bases.
The 1973 Mount Gambier cave diving accident was a scuba diving incident on 28 May 1973 at a flooded sinkhole known as "The Shaft" near Mount Gambier in South Australia.The incident claimed the lives of four recreational scuba divers: siblings Stephen and Christine M. Millott, Gordon G. Roberts, and John H. Bockerman. [1]
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DEPTHX. The Deep Phreatic Thermal Explorer (DEPTHX) is an autonomous underwater vehicle designed and built by Stone Aerospace, an aerospace engineering firm based in Austin, Texas. It was designed to autonomously explore and map underwater sinkholes in northern Mexico, as well as collect water and wall core samples.
Sinkhole. A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet. [1][2][3][4] A ...
Geography. The Zacatonal consists of several enclaves of grassland and shrubland occupying the highest peaks of the Trans-Mexican Volcanic Belt, covering about 306 square kilometers (118 sq mi). Zacatonal is found above 3500 meters elevation on the volcanoes Popocatépetl, Iztaccihuatl, Malinche, Nevado de Toluca, Cofre de Perote, Pico de ...