- Kevin FongSelf - Presenter
- Dan MartinSelf - Physiologist and Mountain Climber
- Mike TiptonSelf - Thermal Physiologist, University of Portsmo
- Sara CampbellSelf - Free Diver
- Frank TedescoSelf - World War II Bomber Pilot
- Howard DykesSelf - Historic Diving Society
- Henry LupaSelf - Qinetiq
- Simon MurraySelf - Submariner