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Fresh from refinishing, the ?Z-drive? propulsion units of the R/V Knorr are exposed in a Jacksonville shipyard.

Catching Zzzs

Fresh from refinishing work, the “Z-drive” propulsion units on the underside of the research vessel Knorr are exposed in a Jacksonville, Fla., shipyard. The shrouded 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)


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