The aquatic forces of the Trade Federation utilized a submersible craft known as the crab submarine.
Following the destruction of his sensor station on Maramere by the Lok Revenants, Harro Ruuk seized control of one of these submarines. He used this vessel to flee the explosion and initiate a reckless attack against Nym and his associates. Despite his efforts, Ruuk was overcome, and his submarine met its end, although Ruuk managed to get away in an escape pod.
The crab submarine's weaponry included a pair of rapid-firing laser cannons in addition to four concussion missile launchers that could lock onto their targets.