I think this article from Reuters of interest to our blog readers interested in defense, submarines and underwater acoustics.
WASHINGTON (Reuters) – Two nuclear-powered Russian attack submarines have been patrolling off the eastern seaboard of the United States in the first mission of its kind so close to shore in nearly a decade, U.S. officials said on Wednesday.
CUBA PORT CALL
One of the Russian submarines remained in international waters on Tuesday a couple hundred miles (km) off the coast of the United States, officials said.
The second sub made a port call in Cuba in recent days, the New York Times reported, citing Defense Department officials who spoke on condition of anonymity. During the Cold War, the United States and Russia regularly sent submarines on secret missions near each other’s coasts. “It is the first time in roughly a decade that we’ve seen this kind of behavior,” Morrell said.
Russia conducted a successful sea trial of the Nerpa last month in the Sea of Japan, according to the RIA news agency. During testing of the submarine in November, 20 people died and 21 were hospitalized when the fire extinguishing system was turned on in error, releasing Freon gas that asphyxiated the victims. The accident, the worst to hit the Russian navy since 118 sailors died in 2000 when the Kursk nuclear submarine sank in the Barents Sea, exposed the gap between the Kremlin’s ambitions and its military capabilities.