Google Tech Talks June 14, 2008 ABSTRACT Scuba diving is a social activity where divers are encouraged to dive in groups of two or more people. However, humans who are underwater are unable to freely verbally communicate or have an instinct to help them keep track of important information such as time, depth, and direction. Thus, we need ubiquitous systems that can provide information quickly and enable communication between divers. Current dive computers are mainly text based with a small font size and equipped with neither communication nor collaboration support for divers. For this reason, it is obvious that the application of computer supported collaborative work (CSCW) into dive computers is necessary. By interweaving CSCW and ubiquitous technology for critical life support systems, it enables us to develop collaborative dive computers to increase activity-awareness, position-awareness, and safety for divers. Due to the nature of the underwater domain and mobile systems, one of...