The Internet Relies on Huge Undersea Cables — And They’re Vulnerable

Recently a digital blackout in Tonga — caused by the severing of the country’s only undersea cable — generated widespread recognition of the submerged systems our connected world depends upon.Not many people realize that undersea cables transport nearly 100 percent of transoceanic data traffic. These lines are laid on the very bottom of the ocean floor. They’re about as thick as a garden hose and carry the world’s internet, phone calls and even TV transmissions between continents at the speed of light. A single cable can carry tens of terabits of information per second.

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