Samanth Subramanian on the undersea cables that run the world

How do undersea cables work and what is their significance in our daily lives? Samanth Subramanian, an award-winning journalist tells us about "fragile cables that connect our world" in his brilliant new book, "The Web Beneath the Waves". They operate behind the scenes and on the sea bed. Over 600 of them carry around 95 per cent of the world's intercontinental traffic. Unlike satellites which get a lot of press, submarine cables are largely unsung until something goes wrong. Take Ghana's stock exchange which, in 2024, had to shut down an hour earlier than scheduled after seismic activity severed some cables. In 2024 Houtis, a rebel group in Yemen, bombed a cargo ship, whose anchor was said to have damaged three cables. And then there's the occasional shark bite too. With barely 69 or so repair ships out there, the entire process of fixing these cables "is delightfully Victorian", says Samanth. We live in an era that this piece of technology holds enormous geopolitical clout too. His research, for his slim book, took him to some of the most unexpected places. The Economist named it as among the best books of 2025.