Animals stopped vocalizing and foraging for food during marine exercises.
Whales subjected to military sonar will neither dive nor feed, according to an unpublished 2007 report from the UK military, obtained by Nature after a request under the Freedom of Information Act 2000.
The impact of sonar on whales has become an increasingly fraught issue in recent years, with submarine exercises being linked to several high-profile mass strandings. The US Navy has admitted concerns over sonar’s effects on marine mammals, although actual evidence for harm has been in short supply.
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