No-Limits Apnea is a AIDA International

AIDA International

The International Association for Development of Apnea is the world wide rule- and record-keeping body for competitive breath holding events . It aims to set standards for safety, comparability of Official World Record attempts and freedive education...

 freediving discipline in which the freediver descends and ascends with the method of his or her choice. Often, a heavy metal bar or "sled" grasped by the diver descends fixed to a line, reaching great depths. The most common ascension assistance is via inflatable lifting bags or vests with inflatable compartments, which surface rapidly. The dives may be performed head-first or feet-first.

This form of diving is considered extremely dangerous by diving professionals; the various organizations that organize and promote breath-hold activities have not officially recognized no limits apnea, given that they’re not willing to deal with the consequent dangers. No-Limits Apnea has claimed several divers' lives.

The current No-Limits world record holder is Herbert Nitsch

Herbert Nitsch

Herbert Nitsch is an Austrian free-diver who has held world records in all of the eight apnea free-diving disciplines recognised by AIDA International. He is the current freediving world record champion and “the deepest man on earth”. This title was given to him, when he set the current world...

 with a depth of 214m set on June 14, 2007 in Spetses

Spetses

Spetses is an island and a municipality in the Islands regional unit, Attica, Greece. It is sometimes included as one of the Saronic Islands. Until 1948, it was part of the old prefecture of Argolidocorinthia, which is now split into Argolis and Corinthia...

, Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

http://www.aida-international.org/aspportal1/code/page.asp?sType=wr&CountryID=4&actID=3&ObjectID=136.