Emergency ascent (diving)
An emergency ascent is an ascent to the surface by a diver in an emergency. More specifically it refers to any of several procedures for getting to the surface in the event of an out-of-air emergency, generally while scuba diving.
Emergency ascents may be broadly categorised as independent ascents, where the diver is alone and manages the ascent by him/herself, and dependent ascents, where the diver is assisted by another diver, who generally provides breathing gas, but may also provide transportation or other assistance. The extreme case of a dependent ascent is underwater rescue or recovery of an unconscious or unresponsive diver, but this is more usually referred to as diver rescue, and emergency ascent is usually used for cases where the distressed diver is at least partially able to contribute to the management of the ascent.
An emergency ascent usually implies that the diver initiated the ascent voluntarily, and made the choice of the procedure. Ascents that are involuntary or get out of control unintentionally are more accurately classed as accidents.
- 1 Terminology for emergency ascents
- 2 Training policies of various certification agencies
- 3 Choice of procedure
- 4 Scuba procedures
- 5 Surface supplied procedures
- 6 Hazards
- 7 Mitigation of hazards
- 8 References
Terminology for emergency ascents
(no assistance required from another diver)
- Bailout ascent is where the diver makes use of a bailout set carried by him/herself to provide an emergency breathing gas supply for this kind of emergency.
- Blow and go is a free ascent where the diver exhales at the bottom before starting the ascent. The breath may be held during part of the ascent, as the lungs are emptied before starting. This procedure is considered unnecessarily hazardous by many recreational training agencies.
- Buoyant ascent is an 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.
- Emergency swimming ascent (ESA) is a free ascent where the diver propels him/herself to the surface by swimming at either negative or approximately neutral buoyancy.
- Exhaling ascent is an ascent where the diver continuously exhales at a controlled rate during the ascent. This may apply to an emergency swimming ascent/free ascent or a controlled emengency swimming ascent, and distinguishes it from a blow and go procedure.
- Free ascent is the procedure used in US Navy submarine escape training. However the term is also used for other emergency diver ascent procedures where breathing gas is not available to the diver during the ascent.
- Open circuit bailout is a change from breathing off the rebreather loop to open circuit, either by physically changing from the rebreather dive/surface valve to an open circuit bailout demand valve, or by switching the rebreather bailout valve from closed to open circuit. This action is taken both when there is a recoverable problem with the rebreather loop, in which case once the problem has been corrected, a reversion to closed circuit is usual, or when the loop has failed irrecoverably, in which case an ascent is made on open circuit, which is generally regarded as an emergency ascent.
- Reserve air ascent is an ascent using a bailout cylinder or the gas in the main cylinder after actuating a reserve valve to release the gas trapped by the reserve valve mechanism. A reserve air ascent is not traditionally considered an emergency ascent, as it was the standard procedure before the use of submersible pressure gauges became widespread.
(assistance provided by another diver)
- Buddy breathing ascent is where the diver is provided with breathing gas during the ascent from the same demand valve (second stage regulator) as the donor, and they breathe alternately.
- Octopus assisted ascent, sometimes just assisted ascent is where the diver is provided with breathing gas during the ascent by another diver via a demand valve other than the one in use by the donor during the ascent. This may be supplied from the same or a different cylinder, and from the same or a separate 1st stage regulator. The divers' breathing is not constrained by each other, and they may breathe simultaneously.
Training policies of various certification agencies
Few issues of diver training have been more controversial than the teaching of emergency ascent procedures. The controversy centers on techniques, psychological and physiological considerations, concern about today's legal climate, and finally the moral issue: is it wise and ethical to train divers in emergency ascent techniques, even though this training may itself be hazardous?
Ronald C. Samson & James W. Miller, 1977
Emergency ascent training policy differs considerably among the certification agencies, and has been the subject of some controversy regarding risk-benefit.
This policy is a general agreement that emergency ascent training is worth the risk on ethical grounds, and recommends those procedures which the agencies consider most appropriate for teaching recreational divers. It does not prescribe training procedures or standards.
This National Scuba Training Committee Ascent Training Agreement recognises that there are a number of options available to the scuba diver in the event of a sudden apparent termination of breathing gas supply at depth, and that the selection of an acceptable response is dependent on several variables, including: depth, visibility, distance from other divers, the nature of the underwater activity, available breath-hold time, training and current competence of the involved divers, stress levels of the divers, obstructions to a direct access to the surface, water movement, equipment, buoyancy, familiarity between divers of procedures and equipment, apparent reasons for air loss and decompression obligations.
Recommendations for training:
- The agreement requires scuba instructors to make students aware of the variables and how they affect the choice of an appropriate response.
- Training should allow divers trained by different instructors to make similar appropriate decisions under the same circumstances, and should provide divers with safe and effective emergency procedures for an out of air situations when not under supervision of an instructor.
- Divers should be taught to agree on emergency procedures before the dive when intending to dive together.
Recommendations for choice of procedure:
- The most desirable option in the dependent category is given as the octopus assisted ascent, where the out-of-air diver is provided breathing gas by a donor via a secondary (octopus) second stage.
- Buddy breathing by two divers on a single second stage is specified as the least desirable of the dependent options.
- The recommended independent option is the emergency swimming ascent, where the diver swims to the surface at roughly neutral buoyancy, while exhaling continuously.
- The final option is a buoyant ascent, where buoyancy is gained by inflation of the buoyancy compensator (not always possible in an out-of-air emergency, and dropping of weights. This is recommended as a last resort where the diver is unsure of making it to the surface by swimming, as it will ensure that an unconscious diver will rise to the surface rather than sink.
No other procedures are recommended in this agreement, though the use of a bailout cylinder may be considered effectively equivalent to either octopus assisted ascent, when gas is supplied by a donor, or not actually running out of gas if it is the diver's own bailout set.
Use of a bailout cylinder is the primary source of emergency breathing gas recommended by several codes of practice for scientific and commercial divers.
The Scottish Sub-Aqua Club holds that training is primarily to deal with potential emergencies and that it should be practical rather than purely theoretical. This implies that it is better to have some practical experience of ability to cope with a simulated emergency situation as this gives greater insight and confidence, as well as proven ability, provided that the risk in training is appreciably smaller than the risk in not being trained.
The SSAC trains open water free ascent from a maximum depth of 6–7 m, initially using a shot line to control ascent rate, and considers the risk small and the benefit significant in view of their statistics which showed an incidence of roughly 16 free ascents per 10,000 dives.
They (1978) recommend responses to an air supply failure, in order of preference, as:
- making use of a companion’s octopus rig,
- then by breathing from an ABLJ,
- then by a shared ascent and,
- as a last resort, by free ascent.
The only reference to emergency ascent training in the CMAS Diver Training Program (CMAS TC Version 9/2002) is in the 1-star course where Controlled buoyancy lift of victim to surface is specified under practical training of rescue skills.
Choice of procedure
- The scuba diver perceives an out of air emergency:
- An option is chosen:
- If a bailout cylinder is carried, the diver switches to personal bailout gas and makes a normal ascent
- If the diver is not carrying a bailout cylinder, and another diver is in the immediate vicinity, the diver may request gas from the other diver
- If the other diver has the gas available and is both willing and competent to provide it, the donor provides emergency gas and the two divers make an assisted emergency ascent while sharing gas using a single demand valve or octopus demand valve, or supplying the receiver from the donor's bailout set
- If the other diver does not help, the distressed diver must make an unassisted emergency ascent
- If there is no other diver in the immediate vicinity, the diver must make an unassisted emergency ascent
- If the diver judges the risk of an unassisted emergency ascent to be sufficiently low, or relatively low compared to the other available options, he/she may choose to do an unassisted emergency ascent although other options may technically exist.
When there is no physical or physiological constraint (such as excessive depth, a physical overhead or a decompression obligation) preventing a direct ascent to the surface, an unassisted emergency ascent may be the lowest risk option, as it eliminates the unknowns associated with finding and requesting aid from another diver. These unknowns may be minimised by training, practice, prior agreement, and adherence to suitable protocols regarding equipment, planning, dive procedures and communication.
Ascent while breathing from the buoyancy compensator
An alternative emergency brathing air source may be available via the buoyancy compensator. There are two possibilities for this:
- If the buoyancy compensator has an inflation gas supply from an independent, dedicated cylinder, this gas can be breathed by the diver by using the inflation valves and the oral inflation mouthpiece. BC inflation cylinders are neither common, nor usually very large, so the amount of air will be small and generally insufficient for staged decompression, but a few breaths on the way up can make a big difference to the stress level of the diver, and may prevent loss of consciousness.
- If the buoyancy compensator is supplied from the breathing gas cylinder, the volume available will be extremely limited, but it will expand during ascent, and instead of dumping it to reduce excess buoyancy, it may be breathed by the diver. Anyone who considers this as an option should ensure that the interior of the BC is decontaminated before use, as it is an environment in which pathogens may breed.
Ascent where the diver is propelled towards the surface by positive buoyancy. Generally recommended as a last resort, though a sufficiently skilled diver could control ascent rate by precise dumping from the BC and use this as a low energy alternative to a swimming ascent. In this case weights should not be ditched during the ascent.
Positive buoyancy may be established by inflation of the BC or dry suit, or by ditching weights. Buoyancy from added air can be controlled during ascent by dumping, but the effect of ditched weights is not reversible, and usually increases as the surface is approached, particularly if a thick wetsuit is worn. If weight can be ditched partially, this may be a better option, unless the diver feels that he is about to lose consciousness, in which case a substantial increase in buoyancy may be better.
A method of buoyancy control which will automatically jettison weights if the diver loses consciousness during the ascent is to take them off and hold them in a hand while surfacing. If the diver loses consciousness, the weights will drop and positive buoyancy will take the diver the rest of the way to the surface.
Controlled emergency swimming ascent (CESA)
Ascent during which the diver propels him/herself towards the surface at a safe ascent rate by means of swimming, usually finning, with continuous exhalation at a rate unlikely to cause injury to the diver by lung overexpansion, and remains under control.
This procedure is recommended for ascents where there is no decompression obligation, a free surface with little risk of entanglement, and the diver has sufficient breath hold capacity to easily reach the surface conscious.
- Advantages of this method, when applicable, are that no outside assistance or special equipment is required.
- Disadvantages are that it requires the diver to reach the surface in a limited time, which does not allow for staged decompression, possible delays due to entanglement or snags, or long distances to reach the surface. It also requires the diver to produce propulsive effort, which reduces potential endurance on the single breath or limited gas available.
Use of the continuous exhalation procedure from moderately (neutrally or relaxed) inflated lungs combines the advantages of lower risk of lung injury compared to either full or empty lungs with improved endurance due to more available oxygen. Keeping the DV in the mouth and attempting to breathe normally or slowly from it may provide additional breaths as the ambient pressure reduces, and helps ensure that the airways remain open.
If the diver is neutrally buoyant at the time that the ascent is initiated, the amount of energy required to reach the surface will be minimised, and frequent controlled venting of the buoyancy compensator can keep the ascent rate under fine control.
Buddy breathing ascent
Ascent during which the diver is provided with breathing gas from the same demand valve (second stage regulator) as the donor, and they breathe alternately.
The out-of air diver must attract the attention of a nearby diver and request to share air. If the chosen donor has sufficient gas, and is competent to share by this method, an emergency ascent may be accomplished safely. Accurate buoyancy control is still required, and the stress of controlling the ascent rate and maintaining the breathing procedure can be more than some divers can handle. There have been occurrences of uncontrolled ascent and panic. In some cases with fatal consequences to both divers.
This procedure is best suited to divers who are well acquainted with each other, well practiced in the procedure, and highly competent in buoyancy control and ascent rate control.
Octopus assisted ascent
(Or just assisted ascent)
Ascent during which the diver is provided with breathing gas by another diver via a demand valve other than the one in use by the donor during the ascent. This may be supplied from the same or a different cylinder, and from the same or a separate 1st stage regulator. The divers' breathing pattern is not constrained by each other, and they may breathe simultaneously.
Lifeline assisted ascent
An ascent where the diver is pulled to the surface by the line tender, either as a response to an emergency signal from the diver, or a failure to respond to signals from the surface. A diver may also be assisted in the ascent by the line tender in a normal ascent, particularly divers in standard dress, where it was often the normal operating procedure.
Surface supplied procedures
Ascent on bailout gas
The diver opens the bailout valve on the helmet, bandmask or harness mounted bailout block. This opens the supply of breathing gas from the bailout cylinder carried by the diver to the demand valve of the breathing apparatus. The bailout gas volume carried by the diver is usually required to be sufficient to return to a place of safety where more gas is available, such as the surface, diving stage or wet or dry bell.
Ascent on pneumo air
Another option for the surface supplied diver is to breathe air supplied through the pneumofathometer hose of the umbilical. The diver inserts the hose into the air space of the helmet of full face mask, and the panel operator opens the supply valve sufficiently to provide enough air to breathe on free flow. Pneumo air can be supplied to another diver by a rescuer in the surface supply equivalent of Octopus air sharing. This procedure would save the bailout gas which would then be available if the situation deteriorates further. Pneumo breathing air supply is not applicable to environmentally sealed suits for contaminated environments.
Lung overpressure accidents
The most direct and well publicised hazard is lung overpressure due to either a failure on the part of the diver to allow the expanding air in the lungs to escape harmlessly, or entrapment of air due to circumstances beyond the control of the diver. Lung overpressure can lead to fatal or disabling injury, and can occur during training exercises, even when reasonable precautions have been taken. There is some evidence that a full exhalation at the start of the ascent in the "blow and go" scenario, can lead to partial collapse of some of the smaller air passages, and that these can then trap air during the ascent sufficiently to cause tissue rupture and air embolism. The procedure of slowly letting the air escape during ascent can also be taken too far, and not allow the air to escape fast enough, with similar consequences. attempting to breathe off the empty cylinder is one way of potentially avoiding these problems, as this has the double advantage of keeping the airways open more reliably, and in most cases allowing the diver several more breaths during the ascent as the reducesd ambient pressure allows more of the residual cylinder air to pass through the regulator and become available to the diver. A 10 litre cylinder ascending 10 metres will produce an extra 10 litres of free air (reduced to atmospheric pressure). At a tidal volume of about 1 litre this would give several breaths during ascent, with increased effectiveness nerer the surface. Of course this air is not available in some cases, such as a rolled off cylinder valve, burst hose, blown o-ring, or lost second stage, where the failure is not simply breathing all the air down to the pressure where the regulator stops delivering, but if it is possible, the demand valve can be kept in the mouth and the diver can continue to attempt to breathe from it during a free ascent.
Loss of consciousness due to hypoxia
One of the dangers of a free ascent is hypoxia due to using up the available oxygen during the ascent. This can be aggravated if the diver fully exhales at the start of the ascent in the "blow and go" technique, if the diver is so heavy that swimming upwards requires strong exertion, or if the diver is already stressed and short of breath when the air supply is lost. Loss of consciousness during ascent is likely to lead to drowning, particularly if the unconscious diver is negatively buoyant at that point and sinks. On the other hand, a fit diver leaving the bottom with a moderate lungful of air, relatively unstressed, and not overexerted, will usually have sufficient oxygen available to reach the surface conscious by direct swimming ascent with constant exhalation at a reasonable rate of between 9 and 18 metres per minute from recreational diving depths (30 m or less), provided his/her buoyancy is close to neutral at the bottom.
The risk of decompression sickness during an emergency ascent is probably no greater than the risk during a normal ascent at the same ascent rate after the same dive profile. In effect, the same ascent rate and decompression profile should be applied in an emergency ascent as in a normal ascent, and if there is a decompression requirement in the planned dive, steps should be taken to mitigate the risk if having to make an ascent without stops. The most straightforward and obviously effective method is for the diver to carry a bailout set sufficient to allow the planned ascent profile if the primary gas supply fails. This makes each diver independent on the availability of air from a buddy, but may cause extra task loading and physical loading of the diver due to the extra equipment needed. This method is extensively used by commercial and scientific divers, solo recreational divers, and some technical and recreational divers who prefer self-reliance. When all else fails, the consequences of missing some decompression time are usually less severe than drowning.
Drowning is the most likely consequence of a failure to reach the surface during an independent emergency ascent, and is a significant risk even if the diver reaches the surface if he or she loses consciousness on the way.
Mitigation of hazards
- The most generally effective method is for each diver to carry an independent bailout set sufficient to safely reach the surface, after completing all required decompression. This is relatively expensive and there may be unacceptable additional task loading to carry the equipment.
- An economical and effective method of reducing risk while sharing air is use of secondary (octopus) demand valves.
- If it is possible, the demand valve can be kept in the mouth and the diver can continue to attempt to breathe from it during a free ascent.
- If the diver is in reasonable doubt of remaining conscious all the way to the surface, positive buoyancy provided by either suit or BC inflation, or by shedding weights can ensure that if the diver does lose consciousness, he/she will at least float to the surface, where there is a better chance of rescue than sinking back to the bottom and almost certainly drowning.
- Diving in teams of two or three divers who are adequately trained and equipped with similar equipment so that emergency procedures are facilitated, and ensuring that the team are always close enough to respond in time to an emergency.
- The diver should not waste time while making the choice of which emergency ascent procedure to use. A controlled swimming ascent is the most recommended default for recreational diving. Divers who venture beyond the safe zone for controlled swimming ascent should be prepared for their most appropriate option at all times.
- Some lung pathologies increase the risk of lung overpessure injury significantly. Divers can inform themselves of these increased risks by undergoing appropriate medical examinations.
- In the event that a free ascent is required, the lung volume should neither be too large nor too small, as both extremes increase the risk of injury. A volume within the normal relaxed range may be suitable.
- Pre-dive discussions and checks to ensure that all members of the dive team are aware of and agree with the procedures to be used if there is an emergency during the dive, and that they are all familiar with the equipment and equipment configuration of all members of the team.
- Adequate emergency ascent procedure training, and sufficient practice to remain adept in the requisite skills.
- During octopus assisted or buddy breathing ascents, divers should remain in close contact.
- A first stage regulator which is to be used with an octopus demand valve should be able to supply the required flow rate without freezing up if the water is cold
- Samson RL, Miller JW (eds.) (1979). "Emergency Ascent Training.". 15th Undersea and Hyperbaric Medical Society Workshop. UHMS Publication Number 32WS(EAT)10-31-79. Retrieved 2008-08-07.
- Verdier C and Lee DA. 2008. Motor skills learning and current bailout procedures in recreational rebreather diving. In: Verdier (ed). Nitrox Rebreather Diving. DIRrebreather publishing. ISBN 978-2-9530935-0-6; http://archive.rubicon-foundation.org/7282: retrieved 2012-03-03
- *Curtis, ASG (1978). "Free Ascents: A view from the Scottish Sub-Aqua Club.". South Pacific Underwater Medicine Society Journal 8 (2). ISSN 0813-1988. OCLC 16986801. Retrieved 2012-03-03.
- Brown, Charles V. (1979). "Emergency Ascent Training.". In Samson RL, Miller JW. 15th Undersea and Hyperbaric Medical Society Workshop. UHMS Publication Number 32WS(EAT)10-31-79: 42. Retrieved 2008-08-07.
- South African Department of Labour Code of Practice for Scientific Diving
- Jablonski, J. 2006, Doing it Right: The Fundamentals of Better Diving, Global Underwater Explorers. ISBN 0-9713267-0-3