Onu-Metru was home of the archivists and miners in Metru Nui. It was best known for the presence of the Archives, where most of the Onu-Matoran in the city were employed. Onu-Metru also contained solid protodermis mines, from which blocks of the material were shipped by boat and airship to Po-Metru for carving.
Toa Whenua defended Onu-Metru, site of the Great Metru Nui Archives. Here could be found samples of every creature and tool ever sighted in the city.
Onu-Metru was best known for the Archives, which took up most of the district and extended far underground.
Onu-Metru workers mined Lightstones. These crystals gave off a bright glow and were used for illumination all over Metru Nui.
Lightstone mine towers were visible all over Onu-Metru.
Solid protodermis was mined in Onu-Metru and was used for works of art and building materials. Onu-Metru miners also stumbled upon small amounts of energized protodermis.
Rahi were delivered in airships to Onu-Metru.
Of all the residents of Metru Nui, Onu-Matoran were regarded as the most unusual, since they spent much of their lives underground. Most Onu-Matoran worked in the Archives and thoroughly enjoyed their work there.
The Archives encompassed most of the surface of Onu-Metru.
The dangerous street sport "Kanoka toss" was a favorite in Onu-Metru. Onu-Matoran took the game one step further, going down to Archive sub-levels to play "Kanoka toss in the dark."
Although much of Onu-Metru was on the surface, Onu-Matoran actually preferred to be in the underground levels of the Archives, because the brightness of the twin suns hurt their sensitive eyes.
Lohrak were first discovered by Onu-Metru miners. They proved to be a particular problem for archivists and maintenance workers.
Onu-Metru had mines and tunnels, in which insect Rahi such as fireflyers lived. Onu-Matoran at times released Metru mantises into these areas to clear them out.
Onu-Metru was the site of the Great Archives.
The inhabitants of Onu-Metru lived and worked underground. This district was the site of the protodermis mines and the famous Archives. Solid blocks of protodermis were shipped from here to Po-Metru for carving, and any wild Rahi caught in the city were sent here to be placed in the Archives.