The Long Core barrel on R/V Knorr is stowed on the deck when not in use, then positioned vertically to be lowered to the ocean floor where it can extract sediment cores up to 45 meters (150 feet) long. Knorr was strengthened in 2005 to accommodate the Long Core and withstand the intense force needed to retrieve it with its load of sediment. (Photo by Alexander Dorsk, Woods Hole Oceanographic Institution)[back]
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