The Underwater Hut was a special hut in Ga-Koro - it could sink into the East Garden. The Ga-Matoran once hid into the hut during a Tarakava attack. The Tarakava broke the mechanism so the Matoran were unable to return to the surface. Macku escaped the attack and got Takua to help them. The Matoran were already running out of air when Takua arrived and saved them. Then the Tarakava returned but was defeated by Gali.