From BIONICLEsector01

How did he reach the center of Aqua Magna, without passing through Metru Nui?

Sorry this didn't get answered until now. The island of Mata Nui was a lot larger than Metru Nui (specific numbers are on each article if you're interested). Depending on where underground the Toa fought against the Bohrok-Kal, when Pahrak-Kal melted through the ground, on its way down it might have missed Metru Nui or even the Mata Nui robot entirely. -- Morris the Mata Nui Cow (talk) 06:09, 7 June 2016 (CET)