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The technique also requires that the dive be divided into 5 minute segments, and the total decompression time accumulated for each 5 minute segment be calculated. To add an element of conservatism, divers lump 5 minute segments into pairs, and use the deeper depth of the pair to calculate the amount of decompression time accumulated. [citation ...
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 .
Sea snakes, crocodiles and marine iguanas only dive in inshore waters and seldom dive deeper than 10 m, but both of these groups can make much deeper and longer dives. Emperor penguins regularly dive to depths of 400 to 500 m for 4 to 5 minutes, often dive for 8 to 12 minutes and have a maximum endurance of about 22 minutes.
Inability to deal with reasonably predictable incidents in a dive. Divers may be pressurised into undertaking dives beyond their competence or fitness. Divers may be pressurised into diving with unsuitable buddies, often by dive professionals who should know better. Objective and accurate knowledge of the diver's capabilities.
Saturation diver working on the USS Monitor wreck at 70 m (230 ft) depth. Saturation diver conducts deep sea salvage operations. Saturation diving is diving for periods long enough to bring all tissues into equilibrium with the partial pressures of the inert components of the breathing gas used.
Deep sea diving is underwater diving, usually with surface-supplied equipment, and often refers to the use of standard diving dress with the traditional copper helmet. Hard hat diving is any form of diving with a helmet , including the standard copper helmet, and other forms of free-flow and lightweight demand helmets .
Divers must avoid injuries caused by changes in pressure. The weight of the water column above the diver causes an increase in pressure in proportion to depth, in the same way that the weight of the column of atmospheric air above the surface causes a pressure of 101.3 kPa (14.7 pounds-force per square inch) at sea level.
Aortic haemoglobin concentration has been observed to rise in diving Weddell seals. High hematocrit blood is stored in the large spleen of deep-diving seals, and may be released into the circulation during a dive, making the spleen an important oxygen reservoir for use during a dive while reducing blood viscosity when the animal is breathing. [3]