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In page South Pacific garbage patch:

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Evidence pointing to the existence of a garbage patch in the South Pacific gyre was made in early 2011 and its existence was confirmed in mid-2017. The discovery was made after a research voyage made by the 5 Gyres Institute.[citation needed] The voyage ran from March to April 2011, following a route based on a model of ocean currents developed by Nikolia Maximenko of the University of Hawaii, which predicts floating debris accumulation zones. The expedition started taking samples off the coast of Robinson Crusoe Island, Chile, and began working its way west, collecting new samples every 50 nautical miles, reaching the waters off Easter Island, and eventually Pitcairn Island.[1]