Authorities in Cuba, the United States and Canada are investigating reports that several foreign diplomats stationed in Havana have been experiencing severe hearing loss in recent months. Some are blaming the deployment of a mystery “covert sonic device” for the diplomats’ symptoms. The allegations originate from diplomatic personnel stationed at the US embassy in Havana. The embassy reopened in 2015, 54 years after it was closed down following a series of diplomatic rifts between Cuba and the US during the height of the Cold War.