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Night diving is underwater diving done during the hours of darkness. It frequently refers specifically to recreational diving which takes place in darkness. The diver can experience a different underwater environment at night, because many marine animals are nocturnal. [1] There are additional hazards when diving in darkness, such as dive light ...
The researchers who documented this behaviour called it "sleep-swimming". [33] Sleep could also be absent during specific parts of a fish's life. Species normally quiescent at night become active day and night during the spawning season. [1] Many parental species forego sleep at night and fan their eggs day and night for many days in a row.
Black-water diving is mid-water diving at night, particularly on a moonless night. The environment is referred to as black-water. [7] [8] The term black-water may also be used to refer to diving in zero visibility, or in sewage. Christopher Newbert, author of Within a Rainbow Sea, (1984) is credited as an early black-water diver. [9]
The ability to dive and swim underwater while holding one's breath is considered a useful emergency skill, an important part of water sport and Navy safety training, and an enjoyable leisure activity. [38] Underwater diving without breathing apparatus can be categorised as underwater swimming, snorkelling and freediving. These categories ...
Recreational scuba diver The undersea kelp forest of Anacapa Island off of the coast of Oxnard, California Diver looking at a shipwreck in the Caribbean Sea. Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. [1]
Kate Winslet, who held her breath underwater for 7 minutes and 14 seconds while filming "Avatar: The Way of Water," said the feat involved both physical and mental conditioning.
A fish's swim bladder controls buoyancy by adjusting the amount of gas in the swim bladder, allowing it to achieve neutral buoyancy at different depths. When a fish's overall density becomes higher or lower than the surrounding water due to volume change of the swim bladder following ascent or descent, it can correct this difference over time ...
For underwater swimming and diving, the side-mounted snorkel has long been the norm, although new-generation full-face swim masks with integrated snorkels are beginning to grow in popularity for use while floating and swimming at the surface. 1950: First use of the word "snorkel" to denote a breathing device for swimmers.