CREON: The Coral Reef Environmental Observatory Network (CREON) is a collaborating association of scientists and engineers from around the world striving to design and build marine sensor networks. Sensor networks on land are becoming common as this exciting technology allows us to view the environment in real time and in many dimensions. Extending this to the marine environment poses many challenges. However the benefits are enormous as we attempt to understand the stresses that are shaping the marine world. In particular coral reefs are exhibiting signs of decay around the world as global warming; over fishing and pollution have an impact. The CREON group is presently deploying sensor networks in locations as diverse as the Moorea LTER Network site in French Polynesia to the shores of Taiwan in the Kenting Coral Reef Group and the Great Barrier Reef. Using a variety of platforms and instruments the CREON group hopes to solve some of the more technical aspects in a collaborative framework. Further details can be found at: www.coralreefeon.org/