The need for underwater wireless communications exists in applications such as remote control in off-shore oil industry, pollution monitoring in environmental systems, collection of scientific data recorded at ocean-bottom stations, speech transmission between divers and mapping of the ocean floor for detection of objects, as well as for the discovery of new resources. Wireless underwater communications can be established by Li-Fi technology. Underwater communications are a rapidly growing field of research and engineering as the applications, which once were exclusively military, are extending into commercial fields, the possibility to maintain signal transmission, but eliminate physical connection of tethers, enables gathering of data from submerged instruments without human intervention, and unobstructed operation of unmanned or autonomous underwater vehicles.