John Healey says three Russian submarines left after being monitored "24/7" by UK forces, with no damage reported. He tells Vladimir Putin: "We see you." The importance of undersea cables - explained Around 600 undersea cables carry electricity and information across international oceans and seas, stretching 870,000 miles (1.4m km). Most of them are data cables, which support almost all of our interne... [7655 chars]
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