Craig Challen is one of Australia's leading technical divers and this was recognised by his peers in 2008 when he was awarded Technical Diver of the Year at the Australian technical diving conference Oztek.

Craig began cave diving in the 1990s and was one of the early adopters of closed circuit rebreather technology. In 2003 he supported Karl Hall on a dive to the end of Cocklebiddy Cave using CCRs, and in 2008 he returned to  Cocklebiddy Cave and extended the line by approximately 130 metres. In 2009, Craig, along with an international cast of cave divers, finally declared the main passage in Cocklebiddy Cave ended. Read the full history of diving in this famous cave here.

Agnes Milowka died in a cave diving accident in Tank Cave, South Australia on February 27th 2011, aged 29 years. She was doing what she loved and did best...laying line in virgin passage and pushing her own limits in a quest to satisfy the burning curiosity to see what was around the next corner. For many people this will be hard to understand. But for true explorers, the feeling of being the first, to be able to lay claim to a small piece of the earth that has never had human eyes upon it is as addictive as any drug. And in this realm, Ag was one of the best.

Linda Claridge is one of Australia's leading cave diving instructors. Together with her cave diving instructor partner, Gary Barclay, they have trained and certified more cave divers in the country than any other instructor.

Linda began cave diving in the early 1990s, and after working her way through the training levels, she obtained her cave diving instructor status in 1998. In addition to teaching, Linda has served in a number of voluntary roles within the Cave Divers Association of Australia.

Veteran Australian cave diver Ken Smith has been cave diving for over 25 years and has dived caves in most areas of Australia: the Lower South East, Nullarbor, Jenolan, Murrindal, Junee Florentine, and the Kimberley. Ken has also traveled overseas to Florida, the Yucatan in Mexico, and Germany. He rates his best cave dives occurred on a recent trip to the island of Abaco in the Bahamas.

Affectionately known as "Mr Pinger", Ken's low frequency radio transmitters used in cave mapping have included him on many cave diving expeditions, including the mapping of the third sump in Cocklebiddy Cave on the Nullarbor.

Dave Warnes has been cave diving for about 50 years. At age 75 he is the oldest active cave diver in Australia.

Dave started cave diving in the Lower South East in the 1960's. He sat on the steering committee for the development of cave diving standards after a series of cave diving fatalities in the late 60's and early 70's. Dave was elected the founding president of the Cave Divers Association of Australia and holds life membership with that organisation. He was responsible for discovery and exploration of a number of caves in the Lower South East and on the Nullarbor.