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Aqua droids were a model of battle droid able to fight both on land and underwater. They were used in the Separatists' attack on Kamino. They also were used in the Separatist's attempt to let the Quarren gain political control the planet Mon Calamari.
They were armed with a retractable laser cannon. For propulsion underwater, their feet could fold into propellers. They were about as tough and powerful as a standard B2 droid, despite their skeletal look. Aqua droids were portable and can fold up to fit into Trident ships. They could also be ordered to do security or construction tasks. Aqua droids had feet that could fold into propellers for underwater propulsion and a head that could be tucked in to their bodies to reduce drag while swimming.
While agile in water, they could not cope with their earlier counterparts on land, making them easy targets during the invasion of Tipoca city. They were stored in a classic droid style with their legs folded in a fetus position against their chest. When active, they rose to a full height, activating their primary ocular sensors. While stored, their ocular sensors retracted like a periscope into their higher torso, protecting it from explosions. They were often armed with retractable laser cannons modified to be more active underwater and under pressure, though they could be regularly modified to fire small grenades or missiles, like their B2 counterparts, by replacing an arm.
History
Despite the fact that the aqua droids were agile and effective underwater, they were ungainly when above water and on dry land. This weakness was one of the main reasons that they were defeated on Kamino. Their presence during the peacetime between the Quarren and Mon Calamari allowed them a quick victory when they were ordered to attack. After the Gungan reinforcements arrived on Dac, they were again used to defeat the army and take control of the planet. They were unsuccessful later, however, when a combined rebellion of Quarren, Mon Calamari, and Republic/Gungan forces overwhelmed the Aqua droids and Riff Tamson, driving the Separatists away from the planet.