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 like 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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My family has spent four summers participating in demand response programs whereby utility companies pay customers to reduce energy use on the hottest summer days. Most summers have involved carefully precooling our New York City apartment before switching off the air conditioners and sweating it out during the designated demand response periods.

But this year, we kept our window air conditioners running throughout a heat dome event that drove daytime temperatures into the triple digits and made the nights oppressively hot. The difference was that we powered the air conditioners through two household batteries tucked away unobtrusively in the corners of our living room and bedroom.

We were among about 1,000 New York City households that took part in a free and growing program offered by the local startup Every Electric. The company’s proposition is simple: Get one or more batteries delivered to your home, plug the batteries into a standard wall electrical outlet, and then plug your window air conditioners into the batteries. Households can keep running air conditioners as usual during peak demand periods while also earning money through the local demand response program with the utility company Con Edison.

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