Made in solid Acrylonitrile butadiene styrene (ABS), these rudders are responsible for Seastick's immersion maneuvers.

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Their functions are not limited to immersion maneuvers but they play a key role in the stabilization of the vehicle: Since the rudders moves indipendently of each other they are used to control the pitch and the roll of the vehicle in order to grant the maximum stability during the missions.