London — Over 95% percent of the world's internet traffic and voice and communication data flows through a vast network of fiber optic cables laid across the floors of oceans and seas. The cables are faster, more reliable and cheaper data carriers than alternatives such as satellites, and they have become indispensable to modern life.

They are the veins and arteries that link our deeply interconnected world, transmitting data for everything from sensitive government and military information and text messages between friends, to trillions of dollars worth of financial transactions every day, underpinning the global economy.

But our reliance on these undersea cables is a vulnerability, and one that rogue actors have allegedly already tried to exploit, including some adversaries of the Un

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