Notes
Metru Nui was located far beneath the surface of Mata Nui. It sat in the center of a silver sea of protodermis.1
Toa Nokama could often be found in the sea of protodermis, using her twin tools to swim through it at amazing speed.2
Mini-dams in Ga-Metru held back tides of protodermis so as not to overflow the metru's canal system.3
Metru Nui was surrounded by a silver sea of liquid protodermis. Its waters were ice-cold.4
After the battle for Metru Nui, the Brotherhood ships had sunk to the bottom of the silver sea [mentioned by name].5
The sea around Metru Nui was dangerous because it contained many nasty creatures.6 The silver sea extended as far as the eye could see from Metru Nui.7