Notes
Metru Nui was located far beneath the surface of Mata Nui. It sat in the center of a silver sea of protodermis.[1]
Mini-dams in Ga-Metru held back tides of protodermis so as not to overflow the metru's canal system.[2]
Metru Nui was surrounded by a silver sea of liquid protodermis. Its waters were ice-cold.[3]
After the battle for Metru Nui, the Brotherhood ships had sunk to the bottom of the silver sea [mentioned by name].[4]
The sea around Metru Nui was dangerous because it contained many nasty creatures.[5] The silver sea extended as far as the eye could see from Metru Nui.[6]