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OceanInsight A collaboration between WHOI and Perkins School for the Blind
Propulsion units on the underside of the research vessel Knorr. The drives can turn 360 degrees, giving the ship a remarkable ability to maneuver and--when combined with a bow thruster--to 'hold station,' or stay in one place, while working at sea. (Photo by James Broda, Woods Hole Oceanographic Institution)