Cas and Jonesy are an Australian duo known for being explorers, endurance athletes, motivational speakers, as well as a writer and documentary producer respectively.

[1][2] On 26 January 2012, Castrission and Jones completed the first unsupported polar expedition from the edge of Antarctica to the South Pole and back without mechanical assistance.

[citation needed] He was educated at Knox Grammar School and then attended The University of Sydney where he undertook a Bachelor of Commerce (Finance & Accounting).

They participated in cadets together and upon leaving school, they began attempting a number of bushwalks and kayak expeditions together, while working separately in various roles.

[7] They set off from Forster, New South Wales on 13 November 2007 and arrived at Ngamotu Beach in New Plymouth, New Zealand on 13 January 2008, taking a total of 60 days, 20 hours and 50 minutes for crossing.

[12][13] It took 89 days and 2275 km of skiing, in what was the longest unsupported polar expedition of all time (the pair also finished along with Norwegian adventurer Aleksander Gamme, who had waited for them).

[14] Pulling everything they needed on a sled behind them and facing temperatures as low as – 40 C, they endured frostbite, crevasses, equipment failure and food deprivation.

[19] Published in January 2010, the book Crossing the Ditch tells the story of Cas and Jonesy's adventure across the Tasman, paddling more than 2000 km kayak from Australia to New Zealand.

[21] In his second documentary, Crossing the Ice, Jones uses recorded footage and interviews to tell the story of the pair's journey over 1,140 km to the South Pole and back again, and the quest to become the first humans to achieve the feat unassisted.