To maneuver this new giant, three 20-foot-tall propellers pull rather than push the boat through the water. The propellers are mounted on swiveling pods along with electric motors (powered by diesel generators in the ship) delivering the equivalent of 30,000 horsepower. This system is more efficient, because it eliminates the need for a long drive shaft, which typically creates drag under the ship. The propellers can rotate 360 degrees, so they also act as the steering system, allowing the captain to make adjustments in port of as small as one foot. "Ten years ago, we felt that 140,000 tons was as big as we could go," says Oasis designer Harri Kulovaara. "Now that we've got the experience, we've taken a quantum leap."