1At a glance
- Typical shared air distance
- Approximately 1-2 metres (3-6 feet)
- Minimum air supply for ascent
- Typically 50 bar (750 psi) at safety stop
- Recommended alternate air source hose length
- Minimum 90 cm (36 inches)
- Standard shared ascent rate
- No faster than 9 metres (30 feet) per minute
- Required training level
- Basic Open Water Diver certification
- Number of breaths to share
- Typically 1-2 breaths per diver before passing
- Primary air sharing methods
- Octopus/Alternate Air Source or Buddy Breathing
2Techniques and Equipment
The primary method for air sharing in modern scuba diving involves the use of an alternate air source, commonly known as an 'octopus' regulator. This secondary second stage regulator is typically brighter in colour (e.g., yellow) and has a longer hose, allowing the diver experiencing the out-of-air emergency to easily access it from their buddy's primary air supply. The diver donating air continues to breathe from their primary regulator while the recipient breathes from the alternate. This method is preferred for its simplicity and efficiency, as it avoids the need for divers to pass a single regulator back and forth.
Older or less common techniques include 'buddy breathing', where two divers share a single primary regulator. This requires precise timing and coordination, with divers taking turns to breathe from the regulator. While taught in basic training, it is generally considered a backup to the alternate air source method due to its complexity and potential for stress in an emergency. Regardless of the method, maintaining neutral buoyancy, staying calm, and communicating effectively (often through hand signals) are crucial for a successful shared ascent.
3Air Sharing Methods Compared
| Method | Equipment Needed | Complexity | Primary Use Case | Liveaboard Relevance |
|---|---|---|---|---|
| Alternate Air Source (Octopus) | Dedicated second stage regulator (octopus) with longer hose | Low | Standard modern procedure for out-of-air | Essential; standard equipment for all dives. |
| Buddy Breathing (Shared Primary) | One primary second stage regulator | High | Backup when alternate air source is unavailable or faulty | Rarely needed, but good to understand as a last resort. |
| Integrated Inflator/Regulator | BC inflator hose combined with second stage regulator | Moderate | Streamlined alternative to octopus, less common | Less common on rental gear; personal preference for some. |
| Pony Bottle/Independent Bailout | Small, separate air cylinder with its own regulator | Moderate (setup) | Self-sufficient emergency air source, technical diving | Common for deep/tech dives; not standard for recreational. |
4Training and Preparedness
Proficiency in air sharing is a fundamental skill taught during entry-level scuba diving certifications, such as the Open Water Diver course. Training typically involves practicing both simulated out-of-air scenarios underwater and surface drills to build muscle memory and confidence. Divers learn how to signal an out-of-air emergency, respond to such a signal, donate air, and execute a controlled, shared ascent while maintaining contact and buoyancy control. Regular refresher courses or practice dives are highly recommended to keep these skills sharp, as they can degrade over time if not rehearsed.
Beyond formal training, divers should ensure their equipment is always properly configured for air sharing. This includes positioning the alternate air source where it is easily accessible to a buddy, typically in the 'triangle' area between the chin and hips, and ensuring the hose is long enough to facilitate comfortable sharing. Pre-dive safety checks with your buddy should always include confirming the location and functionality of each other's alternate air sources.
5Air Sharing on Liveaboards
On a liveaboard, divers often embark on multiple dives per day, sometimes in challenging conditions or unfamiliar environments. While liveaboard operators and dive guides prioritise safety through thorough briefings and equipment checks, the sheer volume of diving increases the statistical likelihood, however small, of an equipment malfunction or miscalculation of air supply. Being proficient in air sharing becomes a significant personal and collective safety asset in such a context, enabling divers to respond effectively without solely relying on guide intervention.
Liveaboard life fosters a strong sense of community and reliance on dive buddies, making air sharing preparedness particularly relevant. Dive guides will typically ensure buddy pairs are established and encourage pre-dive safety checks that include verifying alternate air source accessibility. Knowing that you and your buddy can confidently execute an air sharing procedure adds a layer of comfort and security to your underwater experience, allowing you to fully enjoy the incredible dive sites a liveaboard can access.
6Common misconceptions
Myth: Air sharing is only for beginners who run out of air. Fact: Running out of air can happen to anyone, regardless of experience, due to equipment malfunction, distraction, or miscalculation. Air sharing is a fundamental emergency procedure for all certified divers.
Myth: You just grab your buddy's regulator. Fact: While the intention is right, a proper air share involves clear communication (hand signals), presenting the alternate air source correctly, and a controlled shared ascent. Grabbing can cause panic and difficulty for both divers.
Myth: You have to ascend instantly when air sharing. Fact: The goal is a controlled, safe ascent. You still aim for a slow ascent rate and, if air allows, a safety stop, even when sharing air. Panic ascents increase the risk of decompression sickness.
FAQ
What is air sharing in scuba diving?
Air sharing is an emergency procedure where one diver provides breathable air from their own air supply to another diver who has unexpectedly run out, typically using an alternate air source or by sharing a primary regulator, to enable a safe ascent.
Do I need to practice air sharing?
Yes, regular practice of air sharing techniques is highly recommended. While taught in basic certification, skills can degrade over time. Refresher courses or practice with an instructor or experienced buddy help maintain proficiency for real emergencies.
What equipment is used for air sharing?
The most common equipment for air sharing is an 'octopus' or alternate air source regulator, which is a secondary second stage attached to the donor diver's primary air supply. It often has a longer hose and is brightly coloured for easy identification.
Can I run out of air during an air share?
Responsible air sharing requires the donor diver to have sufficient air to supply both divers for a controlled ascent and safety stop. Donors should always monitor their own air gauge. This is why good dive planning and air management are crucial.
Is air sharing taught in Open Water Diver courses?
Yes, air sharing (both alternate air source use and buddy breathing) is a core skill taught and tested during entry-level Open Water Diver certification courses to ensure all new divers are prepared for this critical emergency scenario.
How does air sharing apply to liveaboard diving?
On liveaboards, where dives are frequent and often in remote locations, proficiency in air sharing enhances safety. It ensures divers can rely on each other in an emergency, complementing the support provided by dive guides and the liveaboard crew.