In 1967 a survey found the deepest point in the lake at 77 m. Major diving exploration of the lake first took place in 1985. Cave diver Peter Horne studied the temperature and visibility of the water. He discovered a fresh water sponge species and other invertebrates. He also discovered "The Stromatolite Field", hollow rock formations on the north-eastern edge at a depth of 40 m. In 2008 another dive brought up core samples from the calcite-silt covered lake bed, and measured the water temperature on the lake bed at 14 degrees Celsius (57 °F).