Line and float-line tangles
Explainer · Last reviewed 2026-08-19
A tangle around a diver is an entanglement hazard rather than an inconvenience, which changes both how it is prevented and what to do when it happens.
Safety
Entanglement — Can cause serious injury or death
A breath-hold diver held by their own shooting line, float line or reel line has only the remainder of one breath, and struggling tightens the tangle while spending oxygen.
What reduces it: Knowing where every line is before descending, keeping the float line clear and behind, breakaway systems near structure, a sharp knife reachable with either hand, and a buddy watching.
Spearfishers carry more line than they think: shooting line on the gun, a float line or reel line to the surface, and sometimes a stringer. Every one of them is a potential entanglement, and the diver's own equipment is the largest source of entanglement incidents in the discipline.
WHERE TANGLES COME FROM.
SHOOTING LINE WRAPPED UNEVENLY on the gun's line guides. It loops on release, catches on the muzzle or a band, and the shot goes wrong at the moment of firing.
FLOAT LINE LOOPING IN FRONT of the diver instead of trailing behind. Any turn, any current change, and it is around an arm or a fin.
REEL LINE PAYING OUT AROUND STRUCTURE while the diver follows a fish. This is the interaction behind most serious entanglement incidents, and it is why hole hunting is the highest-risk technique in the discipline.
SLACK LINE ANYWHERE. Line under tension behaves; slack line finds things.
THE RESPONSE. Stop. Do not thrash — movement tightens a tangle and burns the oxygen you have. Establish what is caught. Use the knife if the line cannot be cleared quickly, and cut without hesitation: line is cheap. Signal the buddy, who should already be watching.
AND THE KNIFE MUST ACTUALLY CUT. Dyneema is very difficult to cut with a dull blade, and a knife that has rusted into its sheath is not equipment.
Prevention is a habit rather than a technique
Know where every line is before descending. That is the whole of it, and it is a habit practised on every dive rather than a skill acquired once.
Wrap the shooting line under even tension. Keep the float line behind and to one side. Do not swim through your own line to reach a fish. Do not enter an opening you cannot back out of.
Use a breakaway where a fish is likely to run into structure, so the gun separates from the fish rather than the diver being connected to both.
Carry the knife where either hand can reach it, because a knife on the right calf is unreachable if the right arm is caught.
And on the surface, keep the float line managed rather than trailing loose. A large share of tangles begin at the surface between dives, where nobody is paying attention because nothing is happening.
Authoritative guidance
Stated by a fisheries authority, scientific institute or recognised angling body. Authoritative, but summarising rather than demonstrating.
- 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 entanglement hazards, line management and emergency cutting equipment.States this directlyCitation checked — the work exists and is described correctly
Where to go next
Where it matters
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.
Hole hunting
The technique that most reliably produces it.
- 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 entanglement hazards, line management and emergency cutting equipment.States this directlyCitation checked — the work exists and is described correctly
Gear this affects
- Dive floats and float linesThe float line is one of the diver's own entanglement sources and is managed rather than merely attached.
- Speargun reelsReel line paying out around structure while following a fish is the interaction behind most entanglement incidents.
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.
Dive floats and float lines
The equipment that causes the problem it also solves.
- 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 entanglement hazards, line management and emergency cutting equipment.States this directlyCitation checked — the work exists and is described correctly
Speargun reels
The architecture most associated with the hazard.
- 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 entanglement hazards, line management and emergency cutting equipment.States this directlyCitation checked — the work exists and is described correctly
Practitioner consensus — 1 connection
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Dive floats and float lines
An explainer carrying a mechanism the equipment record depends on.
- CMAS technical and sporting standards for underwater activities — Confédération Mondiale des Activités Subaquatiques (Standards body)Relied on for: Breath-hold spearfishing practice, equipment convention and the safety expectations set out by the international underwater federation.States this directlyCitation checked — the work exists and is described correctly
- BlueWater Hunting and Freediving — BlueWater Freedivers, Ventura, California, 1995 (Practitioner report)Relied on for: Spearfishing equipment and practice: gun, shaft, tip and rigging choice, and the handling of a shot fish, from a practitioner tradition distinct from the European one.States this directlyCitation checked — the work exists and is described correctly
More explainer
Not related to this page — just the rest of the section, because this record connects to very little and a short page should still lead somewhere.
Sources for this page
- 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 entanglement and emergency equipment.States this directlyCitation checked — the work exists and is described correctly
How FishingHQ labels evidence is explained in the evidence policy.