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Open Clip Art Library SCUBA: Date: 1 March 2010: Source: ... Diving at the 1991 World Aquatics Championships – Men's 1 metre springboard; Diving safety officer;
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Diver down flag being flown on a dive ship. The use of the red and white flag, which was created in the early 1950s by Navy veteran Denzel James "Doc" Dockery of Michigan, and popularized by Ted Nixon of US Divers, [4] is required by law or regulation in many US states, Canada, [5] and some other countries (e.g. Italy). [6]
Example of the Scuba Diver Insignia on a USMC service uniform. The various diver insignia (also known as "diver badges", "dive badges," and colloquially known as "dive bubbles") [1] of the uniformed services of the United States are badges awarded to service personnel once they have graduated an appropriate diving course.
Fins and a diving mask are often used in free diving to improve vision and provide more efficient propulsion. A short breathing tube called a snorkel allows the diver to breathe at the surface while the face is immersed. Snorkelling on the surface with no intention of diving is a popular water sport and recreational activity. [38] [44]
Black-water diving is mid-water diving at night, particularly on a moonless night. [ 9 ] [ 10 ] An overhead or penetration diving environment is where the diver enters a region from which there is no direct, purely vertical ascent to the safety of breathable atmosphere at the surface.
Freediving as a recreational activity is widely practiced and differs significantly from scuba diving. Although there are potential risks to all freediving, it can be safely practiced using a wide range of skill levels from the average snorkeler to the professional freediver. Compared to scuba diving, freediving offers: [citation needed]
Directional line markers were originally used by non-diving cavers to indicate the direction along a guideline towards an exit. The line arrow was invented by Lewis Holzendorf as a triangle of tape folded over the line, but these had a tendency to slide along the line and were not easy to identify in a silt-out.