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The final product of the planning process may be formally documented or, in the case of recreational divers, an agreement on how the dive will be conducted. A diving project may consist of a number of related diving operations. A documented dive plan may contain elements from the following list: [1] Overview of diving activities
A scuba diving emergency is an incident while scuba diving, in which there is a high probability of death or severe injury if the problem is not resolved quickly. [135] A diving emergency may be related to life-support, [1] decompression stress and barotraume, [1] incapacitation or inability to cope, [136] or an acute medical problem. [116]
Narcosis while deep diving is prevented by breathing a gas mixture containing helium. Helium is stored in brown cylinders. The most straightforward way to avoid nitrogen narcosis is for a diver to limit the depth of dives. Since narcosis becomes more severe as depth increases, a diver keeping to shallower depths can avoid serious narcosis.
During the 20th century recreational scuba diving was considered to have generally low environmental impact, and was consequently one of the activities permitted in most marine protected areas. Since the 1970s diving has changed from an elite activity to a more accessible recreation, marketed to a very wide demographic.
An out-of-gas emergency is a life-support emergency which occurs when the breathing gas supply is cut off by running out, supply system failure, or supply system interruption. These are the most urgent of the common diving emergencies, and the ones the diver should be equipped and skilled to manage.
Doing it Right: The Fundamentals of Better Diving page 67 says: "It is the perfect system in zero visibility as well as in crystal clear water. The DIR system requires no modification to function effectively and efficiently in different environments ... In freezing water these divers use dry gloves and thicker undergarments and possibly ...
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Temperate water is water cooler than tropical, and warmer than "cold water". For diving purposes this can be considered the temperature range in which a full wetsuit is acceptable thermal protection for most divers for most diving activities. The range of 10 to 25 °C (50 to 77 °F) could generally be considered temperate water for diving.