Sea Gates

The Sea Gates are passageways located throughout the Matoran Universe.

History
Sea Gates exist in nearly every dome of the Matoran Universe where the robotic body of the Great Spirit Mata Nui intersect with the cavernous habitations, which are connected by canals of Liquid Protodermis. They allow for travel between the various domes of the universe.

Metru Nui
The Sea Gates of Metru Nui are located along the Great Barrier. For most of the history of the Island City, these gates were used for travel to and from the city, as well as for trade convoys to pass through. One such gate was the one leading eventually to the Dome of the industrial Isle of Xia. Eighteen months prior to the Great Cataclysm, Makuta Teridax, posing as Turaga Dume, ordered two of the Toa Mangai to close off these gates. The Toa, accompanied by the Po-Matoran Chronicler Kodan, succeeded in this task but were later killed by the Dark Hunter Eliminator. One of the gates was reopened by the Dark Hunters Nidhiki and Krekka on their way to Metru Nui. "The Shadowed One" and Sentrakh passed through this same Sea Gate on their way to Metru Nui to investigate the deaths of Nidhiki and Krekka. "The Shadowed One" found a Kanohi Kakama belonging to one of the Toa who had been killed by Eliminator, but threw it into the Silver Sea.