Martin Stepanek recaptured his constant ballast, no fins free diving record by reaching 83 m (273 ft.) in a bluehole in Egypt.
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http://www.divefit.com/news.php
The level of effort and athleticism to be able to actively propel yourself particularly without fins through a roundtrip of almost 550 ft. and down over 9 atmospheres is amazing.
Martin and Paul Kotik run
Freediving Instructors and Trainers (FIT) based in Ft. Lauderdale, FL, USA. They offer an insightful free diving training program at multiple levels. Having studied free diving for many decades I was pleasantly surprised to discover how much more useful information and technique there was to learn in their course recently. The safety content alone is worth going through the course not to mention a probable substantial boost in existing free diving abilities.