Especially significant Protodermis Canals ran deep throughout the district of Ga-Metru. Here, the Liquid Protodermis of the Silver Sea were drawn into the Great Temple, where it was purified by Ga-Matoran lab workers. After, the Protodermis was redirected into the canals, which dumped it in a subterranean pipe system. The Protodermis that was collected could also be superheated and sent to Ta-Metru to be molded into Kanohi, Kanoka, and other tools. As a pastime, Matoran were known to perform Disk Surfing on the canals. The Ga-Matoran, who had a special fondness for boats, used to sail miniature replicas of the ships during their free time.
In the Po-Metru district, Protodermis Canals were used when carvings were too large to be supported on loaders. Therefore, the structures were loaded onto flatboats and transported along the canals.
During their quest to recover the Great Disks, Toa Metru Nokama and Matau encountered a Protodermis Canal in Ga-Metru that had been completely drained of Liquid Protodermis. They discovered that someone had manipulated the control wheel to stop the flow. Suddenly, the two Toa Metru were confronted by an oncoming wave of Liquid Protodermis, which engulfed them. Nokama managed to gain control using her Hydro Blades but Matau was swept away. However, Nokama managed to save him and the Toa continued on their quest.
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