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No-limit apnea is an AIDA International freediving discipline of competitive freediving, also known as competitive apnea, in which the freediver descends and ascends with the method of his or her choice. [1] Often, a heavy metal bar or "sled" grasped by the diver descends fixed to a line, reaching great depths.
The tables below have been calculated using a heat capacity ratio, , equal to 1.4. The upstream Mach number, M 1 {\displaystyle M_{1}} , begins at 1 and ends at 5. Although the tables could be extended over any range of Mach numbers, stopping at Mach 5 is typical since assuming γ {\displaystyle \gamma } to be 1.4 over the entire Mach number ...
The basic term Trimix is sufficient, modified as appropriate with the terms hypoxic, normoxic and hyperoxic, and the usual forms for indicating constituent gas fraction, to describe any possible ratio of gases, but the National Association of Underwater Instructors (NAUI) uses the term "helitrox" for hyperoxic 26/17 Trimix, i.e. 26% oxygen, 17% ...
In underwater diving activities such as saturation diving, technical diving and nitrox diving, the maximum operating depth (MOD) of a breathing gas is the depth below which the partial pressure of oxygen (pO 2) of the gas mix exceeds an acceptable limit.
Herbert Nitsch (born 20 April 1970) is an Austrian freediver, the current freediving world record champion, and "the deepest man on earth" [1] having dived to a depth of 253.2 meters (831 feet). Nitsch has held 34 world records in all of the eight freediving disciplines recognised by AIDA International and one in the traditional Greek ...
Umberto Pelizzari (born August 28, 1965) is an Italian freediver, widely considered among the best of all time. Of his era, he is the sole person to have established world records in all the then existing disciplines of freediving.
Trubridge in 2010 Trubridge while freediving. William Trubridge MNZM (born 24 May 1980) is a New Zealand world champion and world record holding freediver.. Trubridge was the first diver to go deeper than 100 metres (330 ft) without oxygen and as of 2013 held the world record in the free immersion and constant weight without fins disciplines.
In July 2008, he broke the constant weight world record for the fourth time with -113 meters. Two months later, with the French freediving team (with Morgan Bourc'his and Christian Maldamé) he became Team World Champion in Egypt. It was the first gold medal for the French Team in a freediving world championship.