As many Snowden-revealed NSA document show, NSA is actively involved with breaking in and tapping undersea cables including high-speed telecom and internet optical fibers. These surveillance, tapping and sniffing may have been enabled both by hacking and by physical submarine operation with secret cover stories even within US DoD.
NSA slide shows surveillance of undersea cables – The Washington Post.
A connected world – The Washington Post.
Undersea Optical Cable Cuts – Cypherpunks.
The Creepy, Long-Standing Practice of Undersea Cable Tapping – Olga Khazan – The Atlantic.
Inside TAO: The NSA’s Shadow Network (scroll down for : Tapping Undersea Cables, SEA-Me-We Undersea Cable Systems (SMW-4) compromise) – SPIEGEL ONLINE.
NSA Spying on Europe/Asia SEA-ME-WE-4 Undersea Telecom Cables | LeakSource.
French telecom operator Orange threatens to sue NSA over cable tapping — RT News.