A worker uses a high-pressure jet of water to clean organisms from the propeller of R/V Atlantis during the ship's period of drydocking in 2012. Removal of biofouling organisms can also occur while the ship is in the water, although access is more difficult. "Almost annually, the Knorr crew requests that we bring in divers and polish the propellers again," said WHOI Marine Engineer Theo Moniz. "They actually gain speed by that." (Photo by Dutch Wegman, Woods Hole Oceanographic Institution)[back]
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