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Buoyant ascent is any ascent where the diver is propelled towards the surface by positive buoyancy. Controlled emergency swimming ascent (CESA) is an emergency swimming ascent which remains under control and which is performed at a safe ascent rate, with continuous exhalation at a rate unlikely to cause injury to the diver by lung overexpansion ...
A similar application is used for emergency ascent when the diver is unable to establish neutral to negative buoyancy, or when this is expected to occur at some point during the ascent, and the diver has a decompression obligation, as when ballast weights have been lost, but the diver is still at the bottom and has a ratchet reel with ...
Emergency tethered ascent, also known as buoyant tethered ascent – Positive buoyancy emergency ascent using a reel upline Emergency wet bell procedures , also known as wet bell emergency procedures – Standard procedures for use in common surface-supplied wet bell diving emergencies
Independent emergency ascents – Where the diver takes independent action and has no assistance. Ascent while breathing from the buoyancy compensator – Use of the gas in the buoyancy compensator to facilitate an emergency ascent where no other gas is available to breathe. Buoyant ascent – Using positive buoyancy to rise to the surface.
Buoyancy emergencies can be too much buoyancy, causing an uncontrolled ascent, or too little buoyancy, preventing the diver from ascending, or sinking them to excessive depths. Loss of diving weights, causing inability to maintain depth. If this happens with a significant decompression obligation, the risk of decompression sickness will be high.
Unlike metal, carbon fibre is naturally buoyant beyond 2,000m, ... detect any deformations, cracks, or other faults rapidly enough for the crew to attempt an emergency ascent. ...
Buoyancy engine – Device that alters a body's buoyancy to provide propulsion; Buoyant ascent – Type of emergency ascent in diving; Buoyant tethered ascent, also known as Emergency tethered ascent – Positive buoyancy emergency ascent using a reel upline; Burst disc, also known as rupture disc – Non-closing over-pressure relief device
Ascending on a decompression buoy while slightly negatively buoyant makes accurate depth and ascent rate control relatively simple, by maintaining light tension on the line as it is reeled in, at the cost of carrying the equipment, a slightly longer time at depth during deployment, a few litres of gas for inflation, and the competence to deploy ...