Solidified Air Bubbles

Air Bubbles were key to the survival of the Matoran of Mahri Nui. They were found in the underwater plants known as airweed and harvested by Hydruka, the only Rahi capable of telling air-rich airweed from depleted airweed. Air Bubbles could "entrap" a Matoran, so he/she would be able to breath underwater away from the city.

The Matoran of Mahri Nui developed a way to use the air bubbles as weapons. Based off the natural abilities of the Hydruka, these Air Launchers fired bubbles of solidified air. On impact, the bubbles dispersed back into a gaseous form, toxic to any species adapted to breathe underwater. Originally intended for transportation purposes by their creator, the tools proved an effective defense for the city since his unfortunate death.