The dolphins died on Monday after swimming up the Percuil River, near Falmouth. Marine experts, wildlife volunteers and vets had battled to save them. The case was Britain’s biggest mass stranding for nearly 30 years, according to Reuters.
Initial autopsies suggested the dolphins might have been scared or disorientated. But officials from the Ministry of Defence (MoD) said the nearby exercises were "highly unlikely" to have been the cause of the deaths.
MoD officials said training exercises with a submarine and survey ship using sonar had also been held in Falmouth Bay.
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