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Devil's Throat At Punta Sur
The Devil's Throat (Spanish: La Garganta del Diablo)Greg Benchwick: Cancun and the Yucatan. Lonely Planet, 2010, p.81/ref> is an underwater cave formation near the island of Cozumel, Mexico, at Punta Sur in the Arrecifes de Cozumel National Park; it starts at approximately of depth and opens up at approximately - right at the edge of recreational dive limits. Overview The Devil's Throat is considered a "must dive" experience by scuba divers visiting Cozumel. Yet, due to the depth and the fact that it is a cave, it is considered an advanced dive and can be dangerous to inexperienced divers as decompression stops may be necessary if progress through the cave is slow. If divers keep moving and do not stop during the dive, decompression stops are not normally needed; standard ascent rates and safety stops are sufficient for a safe ascent. The name "Devil's Throat" specifically refers to a narrow tunnel dropping through the red coral reef structure at around 45 degree, from about to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cozumel
Cozumel (; yua, Kùutsmil) is an island and municipality in the Caribbean Sea off the eastern coast of Mexico's Yucatán Peninsula, opposite Playa del Carmen. It is separated from the mainland by the Cozumel Channel and is close to the Yucatán Channel. The municipality is part of the state of Quintana Roo, Mexico. The economy of Cozumel is based on tourism, with visitors able to benefit from the island's balnearios, scuba diving, and snorkeling. The main town on the island is San Miguel de Cozumel. Etymology The name ''Cozumel'' was derived from the Mayan "Cuzamil" or "Ah Cuzamil Peten" in full, which means "the island of swallows" ( es, link=no, Isla de las Golondrinas). Geography The island is located in the Caribbean Sea along the eastern side of the Yucatan Peninsula about south of Cancún and from the mainland. The island is about long and wide. With a total area of , it is Mexico's largest Caribbean island, largest permanently inhabited island, and Mexico's third ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punta Sur
Punta Sur marks the southern point of Cozumel and is part of the Parque Punta Sur, a ecological park that covers the reefs, beaches, lagoons, and low forest of the surrounding area. The reef system is also part of the Arrecifes de Cozumel National Park. The Celarain lighthouse (''Faro de Celarain'') sits on the Punta Sur promontory (''Punta Celarain'') and is part of a nautical museum. Just northeast of it is the Caracol (''Tumba del Caracol''), a Maya building erected during the post-classic period. There is a persistent myth, often repeated by tour guides, that the building functioned as a weather alarm, producing a whistle that would precede the arrival of a hurricane, but that is only a legend. The idea that the building somehow functioned as a lighthouse or beacon used to send signals to the mainland is another legend, but also incorrect; it was a temple and nothing more. Some of the sandy beaches are protected to allow hatching for sea turtles. Observation towers hav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrecifes De Cozumel National Park
The Arrecifes de Cozumel National Park is off the coast of the island of Cozumel in the state of Quintana Roo, Mexico. The Cozumel reef system is part of the Mesoamerican Barrier Reef System, the second largest coral reef system in the world. Even though almost the entire island of Cozumel is surrounded by coral reefs, the park only encompasses the reefs on the south side of the island. It begins just south of the International Pier and continues down and around Punta Sur and up just a small portion of the east side of the island. The park contains both shallow and mesophotic coral reefs and extends to the 100 m depth isobar. This park is protected under the Ramsar Convention along with Manglares y Humedales del Norte de Isla Cozumel, they both are included in the UNESCO protected area called Isla Cozumel Biosphere Reserve, Mexico. Location The park is located in the municipality of Cozumel in the state of Quintana Roo, Mexico. It is about off the east coast of the Yucatán Pen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scuba Diving
Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface air supply. The name "scuba", an acronym for "Self-Contained Underwater Breathing Apparatus", was coined by Christian J. Lambertsen in a patent submitted in 1952. Scuba divers carry their own source of breathing gas, usually compressed air, affording them greater independence and movement than surface-supplied divers, and more time underwater than free divers. Although the use of compressed air is common, a gas blend with a higher oxygen content, known as enriched air or nitrox, has become popular due to the reduced nitrogen intake during long and/or repetitive dives. Also, breathing gas diluted with helium may be used to reduce the likelihood and effects of nitrogen narcosis during deeper dives. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Coral
Precious coral, or red coral, is the common name given to a genus of marine corals, ''Corallium''. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton, which is used for making jewelry. Habitat Red corals grow on rocky seabottom with low sedimentation, typically in dark environments—either in the depths or in dark caverns or crevices. The original species, ''C. rubrum'' (formerly ''Gorgonia nobilis''), is found mainly in the Mediterranean Sea. It grows at depths from 10 to 300 meters below sea level, although the shallower of these habitats have been largely depleted by harvesting. In the underwater caves of Alghero, Sardinia (the "Coral Riviera") it grows at depth from 4 to 35 meters. The same species is also found at Atlantic sites near the Strait of Gibraltar, at the Cape Verde Islands and off the coast of southern Portugal. Other ''Corallium'' species are native to the western Pacific, notably arou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sponge
Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and that often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes. Sponges were first to branch off the evolutionary tree from the last common ancestor of all animals, making them the sister group of all other animals. Etymology The term ''sponge'' derives from the Ancient Greek word ( 'sponge'). Overview Sponges are similar to other animals in that they are multicellular, he ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurricane Wilma
Hurricane Wilma was an extremely intense and destructive Atlantic hurricane which was the most intense storm of its kind and the second-most intense tropical cyclone recorded in the Western Hemisphere, after Hurricane Patricia in 2015. Part of the record-breaking 2005 Atlantic hurricane season, which included three of the ten most intense Atlantic hurricanes in terms of barometric pressure (along with #4 Rita and #7 Katrina), Wilma was the twenty-second storm, thirteenth hurricane, sixth major hurricane, fourth Category 5 hurricane, and the second-most destructive hurricane of the 2005 season. Its origins came from a tropical depression that formed in the Caribbean Sea near Jamaica on October 15, headed westward, and intensified into a tropical storm two days later, which abruptly turned southward and was named ''Wilma''. Wilma continued to strengthen, and eventually became a hurricane on October 18. Shortly thereafter, explosive intensification occurred, and in only 24 hou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
No Decompression Limit
The practice of decompression by divers comprises the planning and monitoring of the profile indicated by the algorithms or tables of the chosen decompression model, to allow asymptomatic and harmless release of excess inert gases dissolved in the tissues as a result of breathing at ambient pressures greater than surface atmospheric pressure, the equipment available and appropriate to the circumstances of the dive, and the procedures authorized for the equipment and profile to be used. There is a large range of options in all of these aspects. Decompression may be continuous or staged, where the ascent is interrupted by stops at regular depth intervals, but the entire ascent is part of the decompression, and ascent rate can be critical to harmless elimination of inert gas. What is commonly known as no-decompression diving, or more accurately no-stop decompression, relies on limiting ascent rate for avoidance of excessive bubble formation. Staged decompression may include deep st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decompression Stop
The practice of decompression by divers comprises the planning and monitoring of the profile indicated by the algorithms or tables of the chosen decompression model, to allow asymptomatic and harmless release of excess inert gases dissolved in the tissues as a result of breathing at ambient pressures greater than surface atmospheric pressure, the equipment available and appropriate to the circumstances of the dive, and the procedures authorized for the equipment and profile to be used. There is a large range of options in all of these aspects. Decompression may be continuous or staged, where the ascent is interrupted by stops at regular depth intervals, but the entire ascent is part of the decompression, and ascent rate can be critical to harmless elimination of inert gas. What is commonly known as no-decompression diving, or more accurately no-stop decompression, relies on limiting ascent rate for avoidance of excessive bubble formation. Staged decompression may include deep st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen Narcosis
Narcosis while diving (also known as nitrogen narcosis, inert gas narcosis, raptures of the deep, Martini effect) is a reversible alteration in consciousness that occurs while diving at depth. It is caused by the anesthetic effect of certain gases at high pressure. The Greek word (narkōsis), "the act of making numb", is derived from (narkē), "numbness, torpor", a term used by Homer and Hippocrates. Narcosis produces a state similar to drunkenness (alcohol intoxication), or nitrous oxide inhalation. It can occur during shallow dives, but does not usually become noticeable at depths less than . Except for helium and probably neon, all gases that can be breathed have a narcotic effect, although widely varying in degree. The effect is consistently greater for gases with a higher lipid solubility, and although the mechanism of this phenomenon is still not fully clear, there is good evidence that the two properties are mechanistically related. As depth increases, the mental im ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trimix (breathing Gas)
Trimix is a breathing gas consisting of oxygen, helium and nitrogen and is used in deep commercial diving, during the deep phase of dives carried out using technical diving techniques, and in advanced recreational diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. With a mixture of three gases it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas. Oxygen content can be optimised for the depth to limit the risk of toxicity, and the inert component balanced between nitrogen (which is cheap but narcotic) and helium (which is not narcotic and reduces work of breathing, but is more expensive and increases heat loss). The mixture of helium and oxygen with a 0% nitrogen content is generally known as heliox. This is frequently used as a breathing gas in deep commercial diving operations, where it is often recycled to save the expensive helium c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Caves
A sea cave, also known as a littoral cave, is a type of cave formed primarily by the wave action of the sea. The primary process involved is erosion. Sea caves are found throughout the world, actively forming along present coastlines and as relict sea caves on former coastlines. Some of the largest wave-cut caves in the world are found on the coast of Norway, but are now 100 feet or more above present sea level. These would still be classified as littoral caves. By contrast, in places like Thailand's Phang Nga Bay, solutionally formed caves in limestone have been flooded by the rising sea and are now subject to littoral erosion, representing a new phase of their enlargement. Some of the best-known sea caves are European. Fingal's Cave, on the island of Staffa in Scotland, is a spacious cave some 70 m long, formed in columnar basalt. The Blue Grotto of Capri, although smaller, is famous for the apparent luminescent quality of its water, imparted by light passing through underwate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.JPG "Click for more on -> Red Coral")
