"Diver propulsion vehicle" . "swimmer delivery vehicles" . . "scootering" . "swimmer delivery vehicle" . "Diver propulsion device" . "diver propulsion vehicle" . . . . "DPV" . . "STIDD Diver Propulsion Device (DPD)" . . "R-1 swimmer delivery vehicle (SDV)" . . . "delivery vehicle" . . "scooter" . "small underwater vehicles" . . . "Recreational Scooter Diver" . . . . . "Diver Propulsion Vehicle" . "Diver Propulsion Device" . "Dive Propulsion Vehicle" . "underwater scooters" . "underwater scooter" . . . "Diver propulsion vehicle" .