What is Competitive Freediving?
Competitive freediving is a sport of pure physiology, physicality and mental discipline. Athletes descend to incredible depths or swim vast distances on a single breath—no tanks. It is governed by two main bodies: AIDA International and CMAS. These organizations ratify world records, enforce safety standards, and certify judges.
Depth Disciplines (Open Water)
Depth competitions take place in the ocean or deep freshwater. A vertical line is set with a “bottom plate” at a declared depth. Athletes must descend, retrieve a tag, return safely and perform a surface protocol correctly.
Constant Weight (CWT & CWTB)
The diver descends and ascends using fins. In CWT, most use a monofin but two separate fins (bi-fins) can be used; CWTB is restricted to bi-fins. Pulling on the rope is strictly prohibited, and weights must remain constant throughout the dive.
Free Immersion (FIM)
In Free Immersion, the athlete pulls themselves down and up the rope using only their arms. No fins are used. It is often the preferred discipline for those mastering equalization, as the rope provides a controlled rate of descent.
Constant Weight No Fins (CNF)
Considered the purest and most physically demanding discipline, the diver swims vertically using a specialized underwater breaststroke. There are no propulsion aids and no pulling on the rope.
Pool Disciplines (Static & Dynamic)
Pool events test an athlete’s time (apnea) and horizontal distance. These are excellent for year-round training regardless of ocean conditions.
Static Apnea (STA)
The athlete holds their breath face-down in a pool. The focus is entirely on relaxation and CO2 tolerance. Performance is measured strictly by time.
Dynamic with Fins (DYN / DYN-B)
The diver swims horizontally for distance on a single breath. DYN allows monofins and bi-fins, while DYN-B allows bi-fins only. Efficiency and hydrodynamics are the keys to covering the most distance.
Dynamic No Fins (DNF)
The athlete swims horizontal laps using a specialized breaststroke without fins. This discipline requires incredible technique to maintain momentum and minimize oxygen consumption.
Judging and the Surface Protocol
A dive is not officially complete until the athlete proves they are conscious and in control through the Surface Protocol. Within 15 seconds of surfacing, the athlete must:
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Remove all facial equipment (mask or nose clip).
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Signal “OK” with a hand gesture.
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Verbalize the phrase “I am OK” to the judges.
Failure to follow this exact order, or showing signs of a Blackout or LMC (Loss of Motor Control), results in a Red Card (disqualification).
Safety and World Records
Competitive freediving is built on a foundation of safety. Every official event includes sonar tracking, counter-ballast rescue systems, and specialized safety divers who meet the athlete at depth.
To be recognized as a World Record, a performance must occur at a sanctioned competition, be overseen by certified international judges, and pass strict anti-doping protocols.
Frequenty Asked Questions
AIDA was founded by freedivers for freedivers and focuses on the sport’s development. CMAS is an Olympic-recognized federation. Both are elite, but they have slight variations in rules and world record tracking.
Statistically, it is very safe due to 1:1 safety diver ratios, counter-ballast rescue systems, and medical personnel. Most “accidents” (blackouts) are managed immediately at the surface by professionals.
In Static Apnea (STA), top male athletes often exceed 10 minutes, while top female athletes regularly surpass 8 minutes, achieved through years of physiological conditioning.
In CWT, most use a monofin (single blade) but bi-fins are allowed.
It is a cognitive test. It proves the diver has enough oxygen in their brain to perform a multi-step task (remove gear, signal, and speak) within a strict 15-second window.