You will have probably seen ads from a certain beer company and some media spots promoting William Trubridges attempt to break his no fins depth world record (currently 101m). This is part of the competition he organises each year at Deans Blue Hole.
The Head of Safety is another Kiwi - Jono Sunnex and one of the safety divers is Auckland Freediving Club member and Olympic / Commonwealth Games swimming legend Moss Burmester. Jonno is the 11th deepest man on the planet.
Check out this clip from VB2014 focussing on the safety aspects ... http://youtu.be/8idl8mw3WfU
Moss is also posting insights on his web sight (mossburmester.co.nz) and that,as well as other info, is here: http://www.freediving.co.nz/will-trubridge-102m/