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A diver getting ready to dive in front of an alpha flag. As a code signal the International maritime signal flag Alpha (or "Alfa", signifying the letter "A") has the meaning of "I have a diver down; keep well clear at slow speed", [1] used to indicate that the vessel has limited maneuverability, and the presence of a diver in the water around the boat.
Others are more specialised, variable by location, mode, or professional environment. There are instances where a term may have more than one meaning depending on context, and others where several terms refer to the same concept, or there are variations in spelling. A few are loan-words from other languages. There are five sub-glossaries ...
Repetitive dive which is shallower than the previous dive. [55] Multilevel dive in which a later level is shallower than an earlier level. [55] forward roll entry. See: Scuba skills#Entries. Water entry technique used by scuba divers from a boat or platform too high or unsuitable for backward roll entry. The diver bends forward at the hips and ...
The top of the tremie is above water and open, and the bottom end is kept below the surface of the poured concrete. triangular profile A triangular dive profile is one in which, after a descent at constant rate, and a short bottom time at maximum depth, the diver maintains a constant, slow ascent to the surface or first decompression stop.
Buoys for this use are usually either inflated and sealed by a valve or cap, or made from buoyant material, so they cannot deflate or flood during the dive, rendering them ineffective. High-visibility colours such as red, orange and yellow are popular. Sometimes the float includes a small diving flag. If the buoy is to be towed by the diver at ...
Any dive where the diver is decompressed directly after the dive. [25] 2. In recreational diving, a bounce dive is a descent to maximum depth and then a direct ascent back to the surface with minimal bottom time, in a dive profile resembling a spike. BOV. See: bailout valve. bowline. Main article: Bowline
The first rainbow pride flag was designed by Gilbert Baker and unveiled during the San Francisco Gay Freedom Day on June 25, 1978. This flag contained hot pink, red, orange, yellow, green ...
A technical diver using a closed circuit rebreather with open circuit bailout cylinders returns from a 600-foot (180 m) dive. The recreational diving depth limit set by the EN 14153-2 / ISO 24801-2 level 2 " Autonomous Diver " standard is 20 metres (66 ft). [ 127 ]
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