Pairing of buddies Opinions differ in how best to form buddy teams among a group of divers. One school of thought holds that buddies should always be closely matched in skills, experience, and interests so that one diver does not hold back the other in achieving an enjoyable dive. This becomes particularly true when a diver is on an especially expensive or unique diving trip or holiday. This is a suitable arrangement for purely recreational dives. The problem with this approach is that it also pairs up
inexperience – which can be dangerous if a diving emergency arises (fortunately, this is not statistically very often). The alternative is to buddy-up a more experienced diver with a less experienced buddy to counter this "experience gap". This also helps to advance diving skills by having one buddy essentially act as a tutor. The
British Sub Aqua Club strongly encourages and practices this approach, which is appropriate in a club environment where non-instructing members assist in post-certification training. The problems with this system, are that they may limit the more experienced diver's opportunity to dive as he would have wished, and that the less experienced diver is not an ideal buddy to the more experienced diver, who must take an unbalanced share of responsibility, and this constitutes an informal training scenario. Compatibility problems are magnified when divers who do not know one another are paired off as buddies by the dive operator. Numerous harrowing stories abound about diving with "the tail-end-Charlie" or the "buddy from hell" out of such practices. The "perfect buddy" is a long term friend or acquaintance, a partner who matches one's own high level of diving skills, who has the same interests, the same stamina and fitness, and who enjoys the companionship in sharing enjoyable diving. Although the principal reason for instituting the buddy system is the mitigation of the risks in diving, the sharing of diving experiences and the enjoyment of being paired together with a friend, family member, or keen fellow enthusiast while on a dive ranks very highly in the reasons many divers enjoy the recreation of scuba diving.
Equipment use and tasks within the buddy team The buddy system is expected to provide a level of
redundancy within the pair of divers, as a safety backup in case of any equipment failure. Within the overall buddy pair almost all equipment can be seen as part of a combined "redundant system": two tanks, two depth gauges/
dive computers, two lights, two knives or line-cutters, – even two brains. During the dive, measurement instruments (gauges, dive computers, compass, etc.) are available to cross-check one another, a second set of life support equipment (i.e. gas supply) is there as a backup in case of a failure in one of the divers' systems. Sometimes a single special-purpose but non-critical piece of equipment is shared by the buddy team, like a single
deployable surface marker buoy on which to ascend and mark the team’s position or a single underwater metal detector. For the system to work effectively, a buddy team must have a shared and agreed dive plan, and both divers must accept the responsibilities of executing it. The plan will specify the basic parameters of the dive such as maximum depth, route, duration, critical breathing gas pressures and decompression plan, who will lead and who follows, buddy separation procedures, etc. and the dive objectives: is it general sightseeing, to view a wreck, photography, hunting a type of game?. In technical diving, these objectives often become much more complex and very specific – penetration of a particular part of a cave to a particular point. Many diving objectives require allocation of specific roles and responsibilities. For example, in lobster hunting on the west coast of America, buddy teams often split into assigned roles of hunter-game catcher, and stower-catchbag carrier, and overall dive success depends on teamwork and carrying out assigned roles.
Provision of emergency breathing gas An important aspect of the buddy function is providing breathing gas in an out of air (OOA) emergency. This can happen in the event of a regulator failure or using up most of the breathing gas while inattentive, distracted, or dealing with an urgent problem. Part of an effective buddy system is preventing and avoiding out of air emergencies by effective gas management, and effectively managing emergencies when they do occur in spite of diligent monitoring. In the early years of scuba, each diver carried a single second-stage regulator, and in the case of an out of air emergency, the buddy pair made an emergency ascent to the surface while the two divers took turns buddy breathing from the mouthpiece of the remaining functional scuba set. Though this system worked effectively enough in a swimming pool or in open water practice sessions, and sometimes worked for skilled and disciplined divers in actual emergencies, in some cases stress and physical difficulties made it fail. To simplify the procedure for air sharing, the recreational diving industry moved to a configuration that provided each diver an additional second-stage regulator, as a backup to the primary. The backup is known variously as the
octopus stage,
backup,
secondary, or (obsolescent)
safe second. The term
octopus came about because several regulator and other hoses hanging from the first stage made the unit look a bit like an octopus. Two general systems have evolved for carrying and deploying the backup demand valve—one more prevalent in recreational diving and the other commonly found in technical diving (although some crossover exists). In both systems, each diver carries two demand valves. They may be attached to the first-stage regulator of a single tank or to two first stage regulators of twin cylinders or a single cylinder wit a
dual outlet valve. The primary regulator is for normal breathing during the dive, and the secondary regulator ("octopus") is a backup for oneself or an out-of-air buddy. Two basic procedures are in common use: Donating the primary and donating the octopus.
Donating the primary A system recommended by some organisations, mostly those involved in technical diving (GUE, CMAS-ISA, other tech and cave diving groups) is to equip the regulator normally used throughout the dive (the "primary") with a long hose, typically long, proportional to the height of the diver. This is the regulator that is donated to a diver who is out of air. The "secondary" or "backup" regulator is then reserved for the donor diver and is on a short hose, suspended just under the chin by a "necklace" that can break free in an emergency. The principal advantage is that the diver who is in trouble receives a regulator that is known to be working and provides breathing gas appropriate for the current depth—and quite possibly gets air more quickly than if the clipped off octopus were donated. Donation of the long hose is particularly beneficial for cave and wreck penetration diving where divers sharing air may need to pass through small openings, as the hose length lets them swim in single file where necessary. The length of the hose also allows the divers to swim side-by-side or one above the other in all possible arrangements. Another advantage is that the secondary regulator stows out of the way, protected from strong water flow, contamination and snags, and where the diver can notice if it leaks—but remains accessible without requiring the use of hands, as divers can pick up the mouthpiece by dipping their chin. This arrangement is slightly more cumbersome to use and requires greater skill to wear, deploy and recover. Benefits may not outweigh disadvantages for open water divers in relatively low hazard conditions.
Donating the octopus The octopus is usually clearly marked, the convention is a yellow hose and yellow second stage though a luminescent green is sometimes favoured. Many dive equipment manufacturers provide secondary regulators marked exactly to this standard and "tune" them specifically to the role of octopus. The octopus second stage is usually stowed in an easily located, accessible position and is easily detachable from the device that holds it. Most recreational agencies recommend or specify that this position be in the "Golden Triangle" drawn between a divers chin and nipples. The octopus hose is usually made long enough (1.2 metres (4 ft)) so that the divers are not inconveniently crowded against one another when the octopus regulator is in use. The procedure to provide the octopus is that the donor diver hands over the octopus—but if a buddy does not notice the buddy’s distress, the out-of-air diver has been taught to take the stowed octopus. An advantage with this method is that donor handover is consistent in both octopus handover and for handover of any independent bailout device such as a removable pony bottle. As part of pre-dive checks, the team should review the procedure for handing-over or accessing the octopus in out-of-air emergency. In recreational diving, if good gas management practice has been followed, either buddy should have sufficient air for both to safely ascend to the surface, even if the emergency occurs at the end of the dive. This may not be the case where an unplanned decompression obligation exists.
Standardisation of configurations as a safety advantage It is helpful if divers wear their equipment in a way that follows standardised conventions so that buddy partners know where to access that equipment if called on to assist their buddy. As there are several conventions, and divers who do not follow locally popular conventions, it is important for divers planning to dive as buddies to familiarise themselves with the configuration used by the other in the pre-dive checks.
Communication between buddies Diving takes place in what Cousteau called "
The Silent World." The relative silence of the sea is one of the enjoyable aspects of scuba diving, but does not help foster natural means of communication within a buddy team. If they haven't invested in expensive full-face masks that incorporate through-water voice transmission, buddy divers must communicate via non-audible means: standardized hand signals or submersible writing slates.
Hand signals In an effort to insure universal, easily understood signals between divers, the
Recreational Scuba Training Council agencies together defined a set of
hand signals intended for universal use, which are taught to diving students early in their entry-level diving courses. Hand signals may also have more than one variation that may benefit when one hand is occupied, or in limited visibility. In darkness it may be necessary to illuminate the hand signal for it to be understandable.
Underwater slates Underwater slates are useful when there is more detailed information to communicate or remember. A large variety of designs are available. Some clip to the divers BCD, some fit into pockets, some integrated with other units such as the compass and some attach to the wrist or forearm with bungee straps. The basic parts comprise just an underwater pencil attached to a plastic board by a short tether, and a way to attach these to a convenient point on the diver's equipment. Slates are particularly useful for information that must be written down prior to a dive and referenced during the dive: elements of the dive plan (depths, durations, decompression schedule) or a drawn map of the dive area.
Buddy lines A buddy line is a line or strap physically tethering two scuba divers together underwater to avoid separation in low visibility conditions. A buddy line is commonly a short length of about two meters with a floating element between divers to reduce risk of snagging on the bottom. A buddy line is a means of communication. It doesn't need to be particularly strong or secure, but should not pull off under moderate loads. Divers may communicate by
rope signals, but more usually just use the line to attract attention before moving closer and communicating by hand signals. The disadvantage of a buddy line is an increased risk of snagging and entanglement. Divers may need to disconnect the line quickly at either end in an emergency, which is done via a quick release mechanism or by cutting the line, both of which require at least one free hand. A velcro strap requires no tools for release and can be released under tension.
Other communication methods In more advanced diving (particularly penetration diving) divers often use additional
underwater communication methods, including signalling with lights, pulls along connecting lines, or tapping on tanks. Ultrasonic signalling devices that attract the buddy's attention by vibration have been marketed and may have some limited utility.
Buddy separation procedure The generally accepted procedure in the case of buddy separation (or lost buddy), in a recreational open water dive is to search for the buddy for one minute, and if not found in this time, to start the ascent, following appropriate procedures based on any decompression obligations. This rule is taught fairly consistently by recreational diver training agencies, but it is not compulsory and variations in this procedure may be agreed upon by the divers during dive planning. Compliance is variable, as ascent in most cases implies termination of the dive, which may not be welcome to either party. Loss of buddy contact is commonly reported in diving fatalities, but in many cases it is not clear whether loss of contact was a cause or an effect of the fatal incident. In overhead diving, the team member separated from the guide line is considered lost, as the guide line is the means of finding the way out, and the procedure is different. ==Situational awareness==