Glossary of underwater diving terminology. This is a glossary of technical terms, jargon, diver slang and acronyms used in underwater diving. The definitions listed are in the context of underwater diving. There may be other meanings in other contexts.
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Compare with passive additionactivated carbonactivated charcoal. A filter medium used to remove oil, water and odours from breathing air. ADASAustralian Diver Accreditation Scheme: An international commercial and occupational diver certification scheme.
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Also known as ABLJ or horse collar buoyancy compensator. A combination of buoyancy compensator and inflatable life jacket worn on the chest and round the neck. The load is hoisted and lowered by cables from the top of the frame. AGEsee arterial gas embolismaggressive (decompression)Decompression profile tending to shorter overall decompression time for a given pre- ascent dive profile, accepting increased risk of decompression sickness to reduce the overall ascent time. This gas is not directly connected to the surface.
Air is injected into the lower end of the pipe and the rising bubbles entrain water and cause an upward flow which draws the material from the bottom along. Some blooms may be recognized by discoloration of the water resulting from the high density of pigmented cells. Visibility can be severely impaired over a period of hours to days.
ALPArticulated Loading Platform, a type of single point mooring consisting of a buoyant upper structure with a lattice leg linked by an articulating joint to a mooring. A possible consequence of lung overpressure injury. ALPAR vest. A waistcoat (vest) style harness of heavy cloth with strong adjustable webbing straps so that the diver can not slide out under any predictable circumstance. An ascent may be interrupted by stops (q.
The rate at which depth is reduced at the end of a dive. An important component of decompression. A. S. S. E. T. Association of SCUBA Service Engineers and Technicians. Generally the primary breathing gas for the bottom or longest sector of a dive. Not an easy, powerful or elegant kick, but useful in many situations. The fins are angled outwards in opposite directions with the legs straight, then swept upwards and towards the diver by bending the knees in the power stroke.
The knees may move downwards a bit at the same time by bending at the hips for stability. The return stroke feathers the fins by pointing them backwards in line with the body axis, to reduce forward thrust until the legs are straight againbackmountback mount. The practice of carrying a scuba set on the back of the diver, supported by a harness, backplate or stabilisor jacket BCD. Compare with sidemountbackplate. A plate, normally made from metal, which rests against the diver.
Held to the body by harness straps over the shoulders and round the waist. Sometimes also crotch straps and chest straps. Usually used with a back inflation buoyancy compensator. A rigid or semi- rigid structure similar in function to a backplate, usually made of moulded plastic, but sometimes of metal, used either as a stiffener and reinforcement for a jacket style buoyancy compensator, or as the basis of a scuba harness independent of a buoyancy compensator. The backpack supports and stabilises the scuba cylinder on the diver's back. Dive light carried as a spare to be used in case of failure of the primary light.
A bailout block is generally used on open circuit breathing apparatus, the equivalent function on a rebreather is provided by a bailout valve (BOV). The bailout block may be mounted on the side of a diving helmet or full- face mask, or may be mounted in a convenient place on the diver's harness, and includes a bailout valve, used to select the gas source, and one or more non- return valves to ensure that the emergency gas supply is directed only to the diver. A scuba cylinder carried by an underwater diver for use as an emergency supply of breathing gas in the event of a primary gas supply failure. Usually consists of a bailout cylinder with a first stage regulator, and either a second stage regulator or connected to a bailout block or bailout valve (q.
A submersible pressure gauge is also usually provided. Regulator designed to provide a consistent demand effort not affected by cylinder gas pressure or depth. In structure it is the front section of a lightweight helmet from above the faceplate to below the demand valve and exhaust ports, including the bailout block and communications connections on the sides. This rigid frame is attached to a neoprene hood by a metal clamping band, hence the name.
Metricunit of pressure commonly used in diving, equal to 1. Pascal, and nearly equal to standard atmospheric pressure.
Injury caused by pressure difference. Computed by dividing nominal capacity (cubic feet) by cylinder working pressure (psi) to express cubic feet of volume per psi of fill pressure (sometimes multiplied by 1. Used to convert cylinder pressure to free gas volume. A back mounted buoyancy compensator cell used with sidemount harness.
The buoyancy volume is mostly over the lower back. BCBCDsee buoyancy compensator. BCD blowup. Uncontrolled buoyant ascent caused by inability to release gas from the buoyancy compensator faster than it expands due to pressure reduction of ascent. A person on the beach who records when divers enter and exit the water. Typically used during recreational scuba training to keep track of the students, watch the gear, and provide assistance when required.
A demand breathing gas supply system with external exhaust used to provide chamber occupants with breathing gases other than the gas used to pressurise the chamber. Used for treatment gases and emergency breathing gas if the chamber is contaminated. This uses the two flat rings to maintain the third in an upright position when mounted on harness webbing, allowing it to be more easily accessed to clip on stage cylinders. Named after Captain Billy Deans.
Gas mixture is usually continuously analysed at the exit of the blending stick to monitor composition. Passing through a cave from one entrance to a different exit which the diver has not used before. Generally operated remotely by hydraulic ram. A sink hole in a lake or the sea that is often the entrance to a cave. Blue holes in the sea are subject to tides so that their flows regularly reverse. May be single- or double- ended, and if single- ended is usually fitted with a swivel ring opposite the jaws. Commercial diver slang for high pressure gas storage cylinder of around 5.
J. bondage wingsee bungee wing. Derogatory term for bungee wing based on fetishist terminology.
Usually refers to the case where inlet pressure is above ambient pressure already. BOP stack. Blowout preventer stack: An assembly of several blowout preventer rams which may be used to shut off a well. The gas breathed by the diver at the deepest part of the dive. Compare with travel gas and decompression gas. Time used in calculating decompression obligation from decompression tables.
For most tables this is defined as the elapsed time from starting the descent to starting the final ascent to the surface, excluding ascent and decompression time. Device used to measure and record the total time spent underwater during a dive. They do not generally only record bottom time . Any dive where the diver is decompressed directly after the dive. A system for assessing fish populations using video cameras to record fish attracted to a bait canister.
BTVB. Usually clipped to the shoulder D- ring(s) of the harness and looped around the cylinder valve. May be attached to the back of the harness between the shoulder blades, or run continuous from one shoulder D- ring, around the back under the arms to the other shoulder D- ring.
Back inflation buoyancy compensator with shock cord lacing or loops which exert a force on the bladder to oppose expansion during inflation. Upward force on an object immersed in a fluid due to pressure exerted over the immersed surface. The diver wears all the personal equipment to be used for the planned dive, with the scuba tank(s) nearly empty, and the buoyancy compensator empty, in shallow water of the same density as expected on the dive, and adds or removes weights until neutrally buoyant.
After the buoyancy check it is usual to distribute the weights for safety, trim and convenience. BC, BCD, buoyancy compensator device, ABLJ, horse collar, stabilisor jacket, stab jacket or wing. An airtight bladder worn by a diver which can be filled with air and vented to adjust and control the buoyancy of the diver. The skill of maintaining the appropriate buoyancy at any time during a dive.
Device for measuring the actual capacity of a battery relative to its nominal capacity, and the associated functional time for the device that the battery is powering. Mainly used in reference to dive lights and scooters. Used at the top back of the crotch strap in place of a butt- plate (q. A rigid or fairly stiff flexible lower extension to a backplate or other scuba harness supporting butt- plate rails, used for clipping off the lower end of sidemount cylinders to the harness. Diving in a cage designed to protect the diver from potentially aggressive large marine animals, usually sharks. CALMCatenary anchor leg mooring.
Named for the catenary curve of the anchor cables that hold the buoy in position. Also referred to as single buoy mooring, monobuoy or loading buoy. Occasionally caused by contaminated gas supply. The toxic effects of carbon monoxide, usually due to contaminated breathing gas supply.
An emergency procedure which is performed in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person in cardiac arrest. CASsee also critical pressure. Critical Air Supply, the amount of breathing air required to safely exit a penetration dive.