The spearfishing buddy system
Safety · Last reviewed 2026-08-10
One diver down and one watching the surface, close enough to reach them and attentive enough to notice — because blackout is silent and a diver alone does not recover from it.
Safety
Shallow water blackout and breath-hold loss of consciousness — Can cause serious injury or death
A diver blacks out silently on ascent or at the surface. Without a buddy who is watching and close enough to reach them, they drown without any visible struggle.
What reduces it: Dive one up, one down. The surface diver watches their partner's ascent and stays with them until they are demonstrably recovered. Agree roles before entering the water, and get trained in freediving rescue rather than improvising it.
The buddy system exists because of one specific physiological fact: a breath-hold diver who blacks out does not thrash, call out or signal. They go limp and stop, quietly, and unless somebody is watching and close enough to reach them within a short time, they drown.
That is why the standard is one up, one down. Not two people in the water. Not two people diving the same reef. One diver descending while the other stays on the surface, watching that diver, close enough to intervene.
The common failure is not a refusal to dive with somebody. It is two friends in the water at the same time, both hunting, each assuming the other is watching. That arrangement has all the social comfort of a buddy system and none of the protection, and it is the single most important thing this page exists to correct.
What the watching diver is actually doing
The surface diver's job is not company. It is to track where their partner is, watch the ascent, and stay in a position to reach them.
The recovery period is the part most often mishandled. A blackout most commonly occurs at or near the surface, during or just after the ascent, and frequently after the diver has apparently surfaced successfully. The convention among trained freedivers is that the surface diver stays with their partner and watches them for a period after they surface — not until they break the surface, but until they are demonstrably recovered and breathing normally.
That is why 'I saw them come up' is not the same as having watched them. The failure mode is a diver who surfaces, looks fine, and then loses consciousness while their partner has already turned to look elsewhere.
Authoritative guidance
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Diver safety guidance on direct supervision of breath-hold divers, the timing of blackout around surfacing and the surface-watch period.States this directlyPassage read and verified
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Freediving governance body standards on buddy supervision during and after ascent.States this directlyCitation checked — the work exists and is described correctly
Distance, communication and honest limits
Proximity is the constraint that decides whether supervision is real. A watching diver who cannot reach their partner quickly is an observer rather than a buddy, and how close that needs to be depends on the depth, the conditions and the current.
Communication before the dive matters as much as during it. Agreeing who is diving, roughly how long, and what the signal is for a problem removes the ambiguity that produces two people both assuming they are the surface diver.
What this page does not do is set out a rescue protocol. Recovering an unconscious diver is a trained skill with sequence and technique that vary by the standards taught, and reading a paragraph is not a substitute for being taught it. That is one of several reasons the discipline's standing advice is to get proper instruction before diving in a way that could require it.
Authoritative guidance
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Guidance on buddy proximity, pre-dive communication and the need for trained rescue skills rather than improvised response.States this directlyPassage read and verified
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving governance guidance on buddy pairing, communication and supervision.States this directlyCitation checked — the work exists and is described correctly
Where to go next
Fish involved
What these connections rest on (1)
Authoritative guidance — 1 connection
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
King scallop
A link to a safety topic substantial enough to be read in full.
- RNLI water safety guidance: cold water shock and Float to Live — Royal National Lifeboat Institution (Water-safety or diver-training authority)Relied on for: Water safety guidance for coastal and inland users.States this directlyPassage read and verified
Fishing this applies to
- Freediving for spearfishingBreath-hold diving is where the buddy requirement originates.
- SpearfishingOne up, one down is the discipline's standing requirement rather than a preference.
What these connections rest on (2)
Authoritative guidance — 2 connections
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Freediving for spearfishing
Breath-hold diving is where the buddy requirement originates.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Diver safety guidance underlying this connection. Breath-hold diving is where the buddy requirement originates.States this directlyPassage read and verified
Spearfishing
One up, one down is the discipline's standing requirement rather than a preference.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Diver safety guidance underlying this connection. One up, one down is the discipline's standing requirement rather than a preference.States this directlyPassage read and verified
Equipment involved
What these connections rest on (1)
Authoritative guidance — 1 connection
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Weighting and quick release
Freediving body guidance on buddy rescue procedure.
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Freediving standards on buddy procedure and rescue.States this directlyCitation checked — the work exists and is described correctly
Related reading
- Breath-hold physiology for spearfishersBlackout is silent, which is why supervision rather than self-rescue is the answer.
- Corrosion, maintenance and pre-dive inspectionMaintenance in this activity is about the parts under load not failing while they are under load, and a mechanism failure with a loaded gun in company is precisely why muzzle discipline and the buddy arrangement are not separable practices.
- Rescue principles for a blacked-out diverThe rescue principles decide the buddy protocol rather than the other way round, which is where one-up-one-down stops being a slogan.
- Roller and inverted-roller speargunsAlmost every serious speargun injury happens during loading, unloading or handling rather than during a shot, and greater stored energy raises the cost of a slip. The buddy requirement addresses both that and the hazard that actually kills freedivers.
- Shore diving and boat diving comparedShore diving fails on the exit and boat diving fails on the pick-up, and both fail when somebody dives alone. The format changes the hazard and does not change the rule.
- Speargun or pole spear to start withEquipment choice has no bearing whatever on the hazard that actually kills freedivers. One up and one down, on every dive, is the measure that addresses hypoxic blackout, and a beginner who has bought a gun and dives alone has spent money on the wrong problem.
- Using a kayak as a dive platformA person diving alone from a kayak has nobody watching, and a hypoxic blackout is silent. This is the requirement the combination most obviously fails.
What these connections rest on (7)
Authoritative guidance — 7 connections
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
Breath-hold physiology for spearfishers
Blackout is silent, which is why supervision rather than self-rescue is the answer.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Diver safety guidance underlying this connection. Blackout is silent, which is why supervision rather than self-rescue is the answer.States this directlyPassage read and verified
Corrosion, maintenance and pre-dive inspection
A claim that a piece of equipment participates in a hazard substantial enough to have its own record, so that a reader meeting the component is routed to the full treatment rather than to a warning sentence.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Technical and sporting standards for underwater activities, including spearfishing equipment practice, the conduct of the activity and its safety requirements.States this directlyCitation checked — the work exists and is described correctly
Rescue principles for a blacked-out diver
Why the buddy has to be close, derived rather than asserted.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Diving medicine guidance on breath-hold physiology, hypoxic blackout, cold exposure and supervision.States this directlyPassage read and verified
Roller and inverted-roller spearguns
A claim that a piece of equipment participates in a hazard substantial enough to have its own record, so that a reader meeting the component is routed to the full treatment rather than to a warning sentence.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Technical and sporting standards for underwater activities, including spearfishing equipment practice, the conduct of the activity and its safety requirements.States this directlyCitation checked — the work exists and is described correctly
Shore diving and boat diving compared
The buddy system and one-up one-down procedure are published requirements of the diving and freediving safety bodies cited, not a preference expressed here.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Recreational diving safety practice including buddy procedure, entry and exit, surface marking and the decision to abort.States this directlyCitation checked — the work exists and is described correctly
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety guidance including the buddy system, one-up one-down procedure and blackout risk.States this directlyPassage read and verified
Speargun or pole spear to start with
A claim that a piece of equipment participates in a hazard substantial enough to have its own record, so that a reader meeting the component is routed to the full treatment rather than to a warning sentence.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety practice, including hypoxic blackout, the absence of warning symptoms, entanglement and the direct supervision that addresses them.States this directlyPassage read and verified
Using a kayak as a dive platform
A hazard carried by this subject, joined to the safety topic that explains the underlying mechanism.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving safety, the mechanism of hypoxic blackout, and the requirement for direct supervision by a competent buddy on every dive.States this directlyPassage read and verified
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Recognised freediving education and safety standards, including buddy procedure and the one-up-one-down principle.States this directlyCitation checked — the work exists and is described correctly
How this compares
- A pre-dive safety checklistThe belt release and the knife are checked by the buddy, because they are used on a person who cannot check anything.
- How to start spearfishingFinding people to dive with is the safety system rather than a social nicety.
- How visibility changes everythingA surface buddy who cannot see a descending diver is not observing them.
- What to expect on a first diveThe commonest beginner errors are diving alone, overweighting and hyperventilating.
- When conditions turn during a sessionEither person may end the session without justification, which removes the social pressure to stay in.
What these connections rest on (5)
Authoritative guidance — 5 connections
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
A pre-dive safety checklist
Why a buddy check differs from a self-check.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on pre-dive checks, buddy checks and equipment verification.States this directlyCitation checked — the work exists and is described correctly
How to start spearfishing
The second step, and the one that makes the rest survivable.
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Freediving education standards covering equalisation, weighting, buddy procedure and rescue skills.States this directlyCitation checked — the work exists and is described correctly
How visibility changes everything
Visibility is the variable that switches the safety model off.
- BSAC diving safety guidance and annual incident report — British Sub-Aqua Club (Water-safety or diver-training authority)Relied on for: Diving safety guidance on visibility, buddy separation and conditions assessment.States this directlyCitation checked — the work exists and is described correctly
What to expect on a first dive
The mistakes that matter, all of which the buddy structure mitigates.
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Freediving incident contributors including overweighting, hyperventilation, solo diving and end-of-session fatigue.States this directlyPassage read and verified
When conditions turn during a session
The buddy is better placed to notice your deterioration than you are.
- RNLI water safety guidance: cold water shock and Float to Live — Royal National Lifeboat Institution (Water-safety or diver-training authority)Relied on for: Water safety guidance on changing conditions, cold water effects and decision-making.States this directlyPassage read and verified
Sources for this page
- DAN guidance on freediving safety, hypoxia and shallow-water blackout — Divers Alert Network (Water-safety or diver-training authority)Relied on for: Guidance on breath-hold diver supervision and the surface-watch period.States this directlyPassage read and verified
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Freediving standards on buddy supervision.States this directlyCitation checked — the work exists and is described correctly
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