Handout photo taken in December 2003 of the ocean trial of a new robot submarine which is designed to model undersea reef environment and to record the effects of global warming on Australia's Great Barrier Reef. Scientists from the Australian Research Council (ARC) have built the state-of-the-art robotic sub to record the effects of rises in sea temperature on the growth and propagation of coral along the world's largest reef. AFP PHOTO/AUSTRALIAN RESEARCH COUNCIL/HO