Mariana, also called Shorebreak by locals, is the capital of Tangaroa (Helios II), United Empire of Earth(UEE). Located on and around one of Tangaroa's few permanent islands, the city is partially on land and partially underwater, and is protected on all sides by an extensive network of wave breakers. It was initially established soon after the system was discovered as a base for scientists to study the system's peculiar main sequence B-type star.
The city is known as the unofficial headquarters for the sport of sub-surfing, in which athletes pilot extremely maneuverable submarines on, through, and underneath Tangaroa's towering waves.