James Glanz

For most people, the internet may be indispensable, but they take it for granted. Though it is sometimes described as the world’s biggest machine, few spare a thought for its physical core: the vast networks of cables spun across sea floors and continents, the cities of energy-hungry servers speeding along data. Until there is a problem. Any number of things can knock an undersea cable out of service. Landslides can do it. So can a ship dragging its anchor. There may be unintended damage from military skirmishes. And then there is sabotage, a growing concern.