Russian Ships Near Data Cables Are Too Close for U.S. Comfort
Pentagon suspects/fears higher activity of Russian submarines and spy ships in the vicinity of internet submarine cables.
▻http://www.nytimes.com/2015/10/26/world/europe/russian-presence-near-undersea-cables-concerns-us.html?_r=0
The ultimate Russian hack on the United States could involve severing the fiber-optic cables at some of their hardest-to-access locations to halt the instant communications
the concern is part of a growing wariness among senior American and allied military and intelligence officials over the accelerated activity by Russian armed forces around the globe
[...]
Just last month, the Russian spy ship Yantar, equipped with two self-propelled deep-sea submersible craft, cruised slowly off the East Coast of the United States on its way to Cuba — where one major cable lands near the American naval station at Guantánamo Bay.
Obviously, the americans know what they are talking about, cf Operation Ivy Bells (1971)
in October 1971 the United States sent the purpose-modified submarine USS Halibut (SSGN-587) deep into the Sea of Okhotsk. Divers working from the Halibut found the cable in 400 ft (120 m) of water and installed a 20 ft (6.1 m) long device, which wrapped around the cable without piercing its casing and recorded all communications made over it. The large recording device was designed to detach if the cable was raised for repair.