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Trieste is a Swiss-designed, Italian-built deep-diving research bathyscaphe. In 1960, it became the first crewed vessel to reach the bottom of Challenger Deep in the Mariana Trench, the deepest point in Earth's seabed. The mission was the final goal for Project Nekton, a series of dives conducted by the United States Navy in the Pacific Ocean near Guam. The vessel was piloted by Swiss oceanographer Jacques Piccard and US Navy lieutenant Don Walsh. They reached a depth of about 10,916 metres (35,814 ft).
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. A cenote is a type of sinkhole that exposes groundwater underneath. Sink, and stream sink are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock.
Deep diving is underwater diving to a depth beyond the norm accepted by the associated community. In some cases this is a prescribed limit established by an authority, while in others it is associated with a level of certification or training, and it may vary depending on whether the diving is recreational, technical or commercial. Nitrogen narcosis becomes a hazard below 30 metres (98 ft) and hypoxic breathing gas is required below 60 metres (200 ft) to lessen the risk of oxygen toxicity. At much greater depths, breathing gases become supercritical fluids, making diving with conventional equipment effectively impossible regardless of the physiological effects on the human body. Air, for example, becomes a supercritical fluid below about 400 metres (1,300 ft).
SS Thistlegorm was a British cargo steamship that was built in Sunderland, North East England in 1940 and sunk by German bomber aircraft in the Red Sea in 1941. Her wreck near Ras Muhammad is now a well-known diving site.
Yasemin Dalkılıç is a Turkish female free diver who has broken 8 World Records in the sport of freediving. She was known to be the 5th female world champion in this sport and broke the first official world record after the Constant Ballast No Fins category was introduced to the sport with a dive to 40 meters. Her deepest record in constant ballast with fins is 68 meters, limited variable ballast is 106 meters and 120 meters in No Limits category.
Boesmansgat, also known in English as "Bushman's Hole", is a deep submerged freshwater cave in the Northern Cape province of South Africa, which has been dived to a depth of 282.6 metres (927 ft).
Natalia Vadimovna Molchanova was a Russian champion freediver, multiple world record holder, and the former president of the Russian Free Dive Federation. Described as "possibly the world’s greatest freediver," Molchanova set an unparalleled standard in the sport. She believed, “Freediving is not only a sport, it is a way to understand who you are,” reflecting her deep connection to the sport. Throughout her career, she achieved 42 world records and earned 22 world championship medals, 19 of which were gold.
Herbert Nitsch is an Austrian freediver, the current freediving world record champion, and "the deepest man on earth" having dived to a depth of 253.2 meters.
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.
SS Dunraven was built in Newcastle upon Tyne at the C. Mitchell and C. Iron Ship Builders and was launched on 14 December 1872. The ship was owned by a Mr W. Milburn. Powered by both sail and steam, she was planned for the route from Britain to Bombay.
Alexey Molchanov is a Russian champion freediver, multiple world champion, world record holder, and freediving promoter. He is also president of the "Freediving Federation" association, head of freediving school named in honor of Natalia Molchanova, and designer and engineer of the freediving equipment brand Molchanovs. Alexey is a son of Natalia Molchanova – multiple champion and world record holder in freediving.
Hranice Abyss is the deepest flooded pit cave in the world. It is a karst sinkhole near the town of Hranice, Czech Republic. The greatest confirmed depth is 519.5 m (1,704 ft), of which 450 m (1,476 ft) is underwater. In 2020, a scientific expedition to the cave revealed that part of the system apparently reaches 1 kilometre deep, albeit with the lowest reaches sediment-filled. Analysis of the water found carbon and helium isotopes which implied that the cave has been formed by acidic waters, heated by the mantle, welling up from below.
Ilze Hattingh is a South African former professional tennis player.
The Democratic Fascist Party was a clandestine Italian fascist political party. The party is known mainly because its founder and some other members stole the dead body of Benito Mussolini from the Cimitero Maggiore in Milan.
Hotel Terme Millepini is a four-star hotel in Montegrotto Terme, Padua, Italy. It contains 100 rooms and until 2020 was recognized for having the world's deepest pool, the Y-40, which put it in the Guinness World Records. The hotel was first built in 1997 and renovated in 2013.
Pozzo del Merro is a flooded sinkhole in the countryside northeast of Rome, Italy. Situated at the bottom of an 80 m conical pit, at 392 m (1,286 ft) it is the second deepest underwater vertical cave in the world. In 2000 two ROVs were sent to explore its depths; the first, the "Mercurio (Mercury)" reached its maximum operative depth of 210 m (690 ft) without reaching the bottom. The second ROV, "Hyball 300", reached 310 m (1,020 ft) without touching down either. A third dive in 2002 with the more advanced "Prometeo" robot reached the bottom at 392 m (1,286 ft), but discovered a narrow passage continuing horizontally.
Italy competed at the 2015 World Aquatics Championships in Kazan, Russia from 24 July to 9 August 2015. It won at least one medal in all disciplines except high diving.
Alessia Zecchini is an Italian freediver who has set world and Italian records in freediving.
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. The four divers explored beyond their own planned limits, without the use of a guideline, and subsequently became lost, eventually exhausting their breathing air and drowning, with their bodies all recovered over the next year. To date, they are the only known fatalities at the site. Four other divers from the same group survived.
Cave diving is underwater diving in water-filled caves. The equipment used varies depending on the circumstances, and ranges from breath hold to surface supplied, but almost all cave diving is done using scuba equipment, often in specialised configurations with redundancies such as sidemount or backmounted twinset. Recreational cave diving is generally considered to be a type of technical diving due to the lack of a free surface during large parts of the dive, and often involves planned decompression stops. A distinction is made by recreational diver training agencies between cave diving and cavern diving, where cavern diving is deemed to be diving in those parts of a cave where the exit to open water can be seen by natural light. An arbitrary distance limit to the open water surface may also be specified. Despite the risks, water-filled caves attract scuba divers, cavers, and speleologists due to their often unexplored nature, and present divers with a technical diving challenge.
References
- 1 2 3 4 "Women Divers Hall of Fame | Member Roster 4". Archived from the original on 2015-01-19. Retrieved 2008-05-19.
- ↑ Claudia Serpieri - Sharm el Sheikh (Egitto) Archived 2007-07-08 at the Wayback Machine
- ↑ MHM Blue World Diving Center
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