Thomas Cowey, Sinkhole Snorkeling (January Theme: Blue)

Kilsby Sinkhole in Mount Gambier is known worldwide in the cave and free diving communities as one of the best places to practice the sport as it is both incredibly deep and incredibly clear. My girlfriend is seen here trying to swim underwater through a beam of light while her thick wetsuit tries to keep her afloat.

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.