The freediving breaststroke technique used for CNF dives

Constant weight without fins (CNF) is an AIDA International (International Association for Development of Apnea) freediving discipline in which the freediver descends and ascends by swimming without the use of fins or without pulling on the rope or changing his or her ballast; only a single hold of the rope to stop the descent and to start the ascent is allowed.[1] Constant weight without fins is the depth discipline of freediving that is most challenging, because of the physical effort needed to swim without assistance.


The main differences between free diving disciplines that involve diving to depth and those that occur at the surface are: the dive cannot be interrupted, there are periods where work is performed and the diver is impacted by direct effects of pressure.[2]

Current record holders


  1. ^ McKie, N (2004). "Freediving in cyberspace". Journal of the South Pacific Underwater Medicine Society. 34: 101–3. Archived from the original on 2013-10-05. Retrieved 2013-10-05.((cite journal)): CS1 maint: unfit URL (link)
  2. ^ Schagatay E (December 2011). "Predicting performance in competitive apnea diving. Part III: deep diving". Diving and Hyperbaric Medicine. 41 (4): 216–28. PMID 22183699. Archived from the original on February 10, 2014. Retrieved 2014-02-10.((cite journal)): CS1 maint: unfit URL (link)
  3. ^ "Vertical Blue 2023 Day 6: Kateryna Sadurska, Alenka Artnik Set New World Records". 2023-07-27. Retrieved 2023-10-03.
  4. ^ "Kiwi freediver William Trubridge sets world record". Stuff. Retrieved 2018-08-26.