Before you spearfish — this comes first
- Get proper instruction before you spearfish. A recognised freediving or spearfishing course teaches the things that actually kill people in this sport, and reading about them is not the same as being taught them.
- Dive with a buddy, and dive one up, one down — one diver in the water, one on the surface watching them, every dive. A breath-hold blackout is silent and gives no warning; a watching buddy is the difference between an incident and a fatality.
- Stay inside your own training and experience. Depth and breath-hold times are personal, they change day to day, and nobody else's numbers apply to you.
- Understand the conditions before you enter the water: visibility, current, swell, tide, boat traffic and your exit. Conditions decide whether a dive is reasonable far more often than skill does.
- Use equipment you have been shown how to use, check it before every session, and be visible — a marked float and line are how boat traffic knows you are there.
- Never extend a dive for a fish. No catch is worth pushing a breath-hold, and the urge to take one more second is exactly what a blackout feels like from the inside — which is to say, like nothing at all.
What to expect on a first dive
Explainer · Last reviewed 2026-08-19
Cold, breathless, unable to equalise, unable to see much, and no fish — described honestly, because a beginner who expects this stops when they should and a beginner who expects otherwise pushes through.
Safety
Shallow water blackout and breath-hold loss of consciousness — Can cause serious injury or death
A beginner who believes their short dives indicate a deficiency pushes past the point their body signals, while cold and fatigue are already reducing the margin.
What reduces it: Knowing that short dives, cold and no fish are the ordinary first experience; ending the session on shaking, ear pain, disorientation or numbing cold; and never extending a dive for a fish.
The gap between what a first session is like and what the videos suggest is the single largest source of beginner risk, because a diver who believes something is wrong with them tries to correct it by trying harder.
WHAT ACTUALLY HAPPENS.
YOU WILL BE COLD, sooner than expected, even in a suit that seemed adequate on land. Immersion removes heat far faster than air.
YOU WILL BE BREATHLESS. Diving on one breath while excited, cold and working hard is nothing like holding your breath in a pool. Times will be short. That is correct and it is not a deficiency to be trained away in a first season.
EQUALISING WILL BE AWKWARD. Most beginners cannot equalise head-down at first and must learn it properly, from an instructor.
YOU WILL SEE FEWER FISH THAN YOU EXPECTED, and they will leave. A person entering the water is a large noisy predator, and the fish that were there thirty seconds ago have moved.
YOU WILL PROBABLY CATCH NOTHING. This is the ordinary outcome and is not an equipment problem.
AND YOU WILL BE TIRED in a way that surprises you, because finning, cold and breath-holding compound.
All of that is normal. What is NOT normal, and ends the session immediately: any shaking or twitching at the surface, ear pain, disorientation, or cold that has stopped registering as uncomfortable.
The mistakes that matter
Most beginner errors cost fish. These cost more.
DIVING ALONE, or with somebody who is not watching. The commonest and by far the most consequential.
OVERWEIGHTING, usually because descending felt hard and lead seemed like the answer. It is the correction that makes an unconscious diver sink.
HYPERVENTILATING before a dive, usually copied from a video. It removes the warning without adding oxygen.
PUSHING THROUGH A FAILED EQUALISATION, which is how eardrums perforate.
CHASING A FISH ON A DIVE THAT WAS ALREADY ENDING. This is the specific mechanism behind a great many incidents: the decision to stay down another few seconds is made by somebody who is already hypoxic and whose judgement is the thing being impaired.
AND STAYING IN TOO LONG. Sessions get longer as the diver gets colder and more tired, and both reduce the margin. The last dive of a session is statistically the dangerous one.
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: Freediving incident contributors including overweighting, hyperventilation, solo diving and end-of-session fatigue.States this directlyPassage read and verified
Where to go next
Where it matters
- Shore divingCold, breathless, unable to equalise and no fish is the ordinary first experience rather than a deficiency.
- SpearfishingThe beginner's entry into the discipline, and the point at which the training requirement is either met or skipped.
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.
Shore diving
Expectation-setting prevents the pushing-through that causes incidents.
- 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
Spearfishing
A membership assertion rather than a topical one: this record teaches the discipline or its equipment, so the discipline's mandatory safety posture applies to it.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing as a defined discipline with its own technical, equipment and safety standards, set out by the international underwater federation.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: That the safety requirements of breath-hold diving apply across the discipline rather than to particular equipment or techniques within it.States this directlyPassage read and verified
How this compares
- Breath-hold physiology for spearfishersShort dives while cold and excited are normal, and are not a capability to be trained away in a first season.
- The spearfishing buddy systemThe commonest beginner errors are diving alone, overweighting and hyperventilating.
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.
Breath-hold physiology for spearfishers
The physiology behind the expectation.
- 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
The spearfishing buddy system
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
Sources for this page
- AIDA International freediving education and safety standards — AIDA International (Water-safety or diver-training authority)Relied on for: Freediving training standards and beginner expectations.Background and mechanism onlyCitation checked — the work exists and is described correctly
How FishingHQ labels evidence is explained in the evidence policy.