Modern submarine cables use fibre optic technology and are typically as wide as a garden hose. Lasers on one end fire at rapid rates down thin glass fibres to receptors at the other end of the cable. These glass fibres are wrapped in layers of plastic – and sometimes steel wire – for protection. Cables lie on the ocean floor, while nearer to the shore they are buried under the seabed for additional protection. The subsea cable connecting Shetland and the Faroe Islands was damaged last week, with a separate cable linking Shetland with the Scottish mainland also being cut on Thursday. Broadband and mobile connections have been reinstated through a temporary fix as engineers continue repairs, Internet and phone services have been restored in Shetland after two subsea cables were damaged. Can the under sea cables security be guaranteed 100%?

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