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New Rolex Sea-Dweller 4000 Watch: Baselworld 2014 - $287.00 : replica rolex, myrolexwatches.top
























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New Rolex Sea-Dweller 4000 Watch: Baselworld 2014


$325.51  $287.00Save: 12% off












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Conquering the deep
Under pressure








To understand the importance of the Sea-Dweller, we need to look back to the heyday of man’s attempts to conquer the deep, in the early 1960s. The depth limit for scuba diving with compressed air was some 60 metres, principally for physiological reasons as the pressure beyond such a depth causes the air to become toxic. Nitrogen, which makes up almost 80 per cent of ordinary air, can have a severe narcotic effect – commonly known as the ‘rapture of the deep’ – which alters the mind of even the most experienced divers. From 66 metres down, oxygen also becomes dangerous as hyperoxia affects the nervous system, leading to seizures and loss of consciousness.Counteracting these gas build-ups is not simply a question of returning quickly to the surface, because the diver risks the bends: 40 minutes spent at 60 metres below sea level requires a slow ascent of two hours interspersed by several decompression stops, which must be scrupulously respected to allow the release of the inert gases that have built up in the body – with the accompanying problem of needing sufficient air to stay underwater as long as that takes. And decompression time increases exponentially with depth. To overcome the 60-metre barrier, other solutions were clearly needed.These emerged in the early 1960s with two innovations: the development of alternative breathing gas mixtures to avoid the toxic effect of air, and the concept of saturation diving which would reduce decompression time and the attendant risks.Synthetic airIf ordinary air becomes toxic for the human body under the effect of pressure, why not breathe something else? The development of synthetic breathing mixes unlocked the gates to the deep sea. Ordinary air is composed of approximately 80 per cent nitrogen and 20 per cent oxygen, but only oxygen is metabolized by the body and is therefore essential. However, nitrogen becomes toxic and divers fall victim to nitrogen narcosis at depths of 40 to 60 metres, depending on the individual. Scientific research has shown that the proportion of nitrogen in the air may be replaced by helium, and that an artificial helium-oxygen mix (heliox) can be breathed by human beings without any physiological effects. It does not cause narcosis at pressure either. Oxygen toxicity could furthermore be avoided by increasing the proportion of helium in the mix. As a result, the 60-metre barrier could be crossed.Later, other limitations – such as high-pressure nervous syndrome caused by prolonged diving at more than 150 metres using heliox – were circumvented by using gas cocktails with differing quantities of hydrogen, oxygen, helium and nitrogen. With a combination of gas mixes – using different mixes at different stages of the dive – diving limits were pushed even deeper from the early 1960s onwards and decompression times reduced. In 1961, a dive in open water was made to 222 metres in Lake Maggiore in Switzerland. The following year, a diver reached a depth of 313 metres in the Pacific Ocean, off the coast of California. A record that surprised the whole diving community at the time and paved the way for new marine exploration.











Reference: 116600
















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