Three fixed-pitch propellers provide "Arktika" with its thrust, power, and maneuverability. The starboard and centerline propellers turn clockwise while the port turns counter clockwise to compensate. Each propeller sits at the end of a 20 meter (65.6 ft) shaft and has four blades, which weigh seven tons and are attached by nine bolts to the hub which is 5.7 meters (18.7 ft) in diameter and weighs 50 tonnes. "Arktika" also carries four spare blades along with the appropriate diving equipment and tools so that propeller repairs may be made at sea; the operation can take anywhere from one to four days depending on the extent of the damage.