Aqua-Dalek

Aqua-Daleks were Daleks who participated in battles in the sea and elsewhere under the water with their version of Hoverbout.

Characteristics
Aqua-Dalek units were basic bronze Daleks which operated aquatic vehicles similar to hoverbouts and Dalek Space-Commando Units. (COMIC: The Dalek Project) As seen on Phijax III, bronze Daleks could also operate independently underwater (PROSE: The Battle of Phijax III) as they could through space. (TV: The Parting of the Ways)

History
The Black Dalek on Survey Ship Sigma sent forth a trio of Aqua-Dalek units to attack a submarine used by the Eleventh Doctor, Edward Anderson and Lord Hellcombe. Though they inflicted some damage upon the submarine, its occupants successfully vacated the craft as it surfaced. (COMIC: The Dalek Project)

Behind the scenes
Bronze Daleks were previously seen operating independently underwater in the Dalek Wars story The Battle of Phijax III and on a Battles in Time trading card.