Guillaume dove 115 m CWT (snorkeling gear) during the contest. Not sure if he went after CNF as shown in the video during the Vertical Blue competition in April 2010 held in Dean's Blue Hole.
http://www.suunto.com/en-us/About-Su...und-Freediver/
It is fun to mess around with just a mask and a bit of negative buoyancy, particularly on wrecks and dropoffs. Just watch out for cuts.