The vast majority of the world's data - emails, financial transactions, the internet - is carried by fiber optic cables that run along the ocean floor and converge at a few narrow choke points. Periodically, policymakers will release reports noting that this arrangement seems risky, but these routes are the shortest, often in use since the telegraph era, and the system has managed remarkably well. Cables break regularly, and traffic gets rerouted until a repair ship can come and fix the cut. But