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Another theory that has gained credence is disturbance of echo-location, possibly by naval sonar. In 2005, after a report by the Department of Environment showed a possibility of stressed whales being further upset by noise, the Royal Australian Navy said that it would avoid operations in areas where whales were beaching. A naval ship had been using sonar near where 145 whales and dolphins died at Mation Bay on Tasmania's east coast in October of that year.
In 2006, after the death of a bottlenose whale stranded for two days in the Thames, marine scientists blamed navy sonar and military explosions for disorienting the mammal.
Tasmania's Department of Primary Industries and Water confirmed that they are investigating whether any seismic activity may have interfered with today's stranded animals.