In the Tunnels of Teridax Nui the Makuta guard there most secret treasure, the island of Mata Nui (Note: The last remains got back to place and sank into the tunnels). In difference to other tunnels is this tunnel very dangerous. After Mata Nui rose from his great sleep it was a big earthquake in the tunnels when Teridax Nui was created and the most ways in the tunnels were destroyed. Makuta Frofst is currently here to make it up to Teridax Nui and show the Makuta that he is the new leader.