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Semi-dry suits are effectively wetsuits with watertight seams and nearly watertight seals at wrist, neck, ankles and zip. They are typically used where the water temperature is between 10 and 20 °C (50 and 68 °F). The seals limit the volume of water entering and leaving the suit, and a close fit minimises pumping action caused by limb motion.
Water carries heat away far more effectively than air. Evaporative cooling on the surface is also an effective mechanism of heat loss, and can affect divers in wet diving suits while travelling on boats. [46] Diving suits are available that are suited to a wide range of water temperature down to freezing. [47]
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Hypothermia is reduced body temperature that happens when a body dissipates more heat than it absorbs and produces. [20] Clinical hypothermia occurs when the core temperature drops below 35 °C (95 °F). [21] Heat loss is a major limitation to swimming or diving in cold water. [8]
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Diving safety is the aspect of underwater diving operations and activities concerned with the safety of the participants. The safety of underwater diving depends on four factors: the environment, the equipment, behaviour of the individual diver and performance of the dive team.
Hot water can cause overheating of divers, and this can be difficult to prevent. Professional divers diving with surface-supplied equipment may use a flow of cooling water analogous to a hot water suit. Tropical water is the natural temperature of bodies of water in tropical regions, due to heating by the sun and cooling by wind.
The temperature of the diving environment can influence the equipment used by the diver, and the time the diver can be exposed to the environment without excessive risk. Diving in hot water – Diving in conditions where active cooling is necessary; Diving in warm water – Diving in conditions where no thermal protection is needed