Despite the expansion of Starlink and other communications satellite services, most of the world’s Internet traffic still travels through subsea cables crisscrossing the ocean floors. Those fiber-optic cables coexist with a network of oil and gas pipelines and submarine power cables—and all these crucial links connecting countries and continents now face growing sabotage risks as gray-zone warfare and open conflicts have become widespread.

The rising risks to the world’s invisible infrastructure beneath the waves are the main subject of a new book by Elisabeth Braw, a senior fellow at the Atlantic Council who leads the Threats to the Global Maritime Order Initiative. Her book, titled Undersea War, explores the modern rise in suspicious incidents in which ships dragging their anchors for unusually long periods have cut or damaged undersea cables and pipelines from the Baltic Sea to the Pacific Ocean.

Braw acknowledges that about 60 percent of undersea cable damage is primarily due to human error during fishing and shipping activities, when weighted nets or anchors drag across the seabed. Natural hazards such as storms and undersea landslides also account for a smaller proportion of such incidents. In total, between 150 and 200 cables are damaged each year and usually repaired quickly.

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