Prosecutors claimed five Royal Caribbean ships, including the Nordic Empress, pumped oily bilge water overboard off the coast of Puerto Rico as well as in the Pacific Ocean between ports in Canada and Alaska.
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The Nordic Prince, which was later sold, was one of five Royal Caribbean ships equipped in the early 1990s with makeshift pipes to bypass the oil water separator and dump contaminated bilge water directly overboard.
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The authorities were prepared to overlook a fifth violation _ a faulty divider for oil and bilge water _ which the ministry said could be repaired after the vessel returned to its home port of Wonson.
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The violations in Alaska included four counts of dumping oily bilge water into the Lynn Canal between Skagway and Haines and discharging dry-cleaning chemicals and other toxic waste into Gastineau Channel, within the Juneau city limits.
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MT " Glenn Guardian ", one of the vessels owned by a Malaysian firm, had collected some of domestic waste and about of bilge water from the USS " Emory Land ", an American Navy ship.
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A spill of bilge water from a Chinese freighter in a Peruvian harbor probably released the Asian bug that caused as many as a million cases of cholera that spread throughout Latin America and touched the United States.
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While the town relies heavily on cruise ship revenue, it has a rocky history with Royal Caribbean dating back at least two years when the shipping line admitted dumping oily bilge water and other pollutants into area water.
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The proliferation of the goby and other alien species is caused mainly by bilge water discharges from the ocean-going ships that have been entering the Great Lakes through the St . Lawrence Seaway for the last 40 years.
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Still, Japanese authorities also hedged, saying " soft fixes " _ such as agreeing not to pump oil and bilge water overboard _ could be enough for the Mangyongbong to return to its home port of Wonsan for full repairs.
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Others fear that ships arriving unannounced could cut through sea ice, leaving Inuit hunters marooned on ice flows, or that water tanker ships would fill with melting glacier water, after pumping into the Arctic bilge water contaminated with foreign organisms.