British Columbia is home to a thriving group of companies that develop and market the technology required to exploit the underwater  environment.  After a brief survey of the technology and its historical development, we will describe current underwater equipment and its Commercial, Governmental and Military applications.  We will then proceed to the focus of this presentation: The wireless communications  methods and equipment  that are currently used in the underwater environment with emphasis on those used by International Submarine Engineering and other firms involved in near term and long term robotic research. Finally, we will discuss future planning for harbour, near shore and open ocean security efforts by Department of Homeland Defense, NOAA, US Coast Guard and US Navy.