Emerging global security concerns are shifting attention to the ocean floor, where critical infrastructure such as submarine communications cables and energy pipelines face increasing vulnerabilities. This growing threat landscape, highlighted by catastrophic incidents like the 2022 Nord Stream pipeline sabotage, has prompted governments and defense firms to ramp up efforts in underwater surveillance and protection. Technologies including autonomous underwater vehicles (AUVs), sensors, and advanced AI-driven systems are being developed to monitor vast subsea networks essential to the global economy.

Defense companies are increasingly investing in the underwater domain, recognizing it as a crucial frontier for future warfare and infrastructure defense. Italian shipbuilder Fincantieri, for example, plans to acquire four companies for approximately €600 million ($689 million) to build capabilities in underwater drones, marine surveying, and subsea communications. Fincantieri’s CEO Pierroberto Folgiero envisions surface ships acting as coordination hubs for fleets of autonomous vehicles operating in the water column, signaling a shift from traditional underwater operations to a high-tech, drone-dominated ecosystem.

Germany’s Euroatlas is among the firms pioneering autonomous underwater vehicles designed for continuous patrolling and detecting threats like mines or hostile drones without constant human control. Its GrayShark AUV, featuring obstacle avoidance and preprogrammed mission capabilities, exemplifies the drive toward machine-led surveillance to cover underwater expanses too large and expensive for conventional ships and submarines. Besides infrastructure protection, autonomous systems are also being developed to counter enemy underwater drones, heralding a new era of machine-on-machine engagement beneath the waves.

Despite technological advances, experts caution that full protection of millions of kilometers of subsea infrastructure is unachievable, and surveillance technology serves more as deterrence and intelligence rather than a complete solution. The responsibility for safeguarding seabed assets is complex, involving both private operators and governments, and will require enhanced cooperation and investment. Moreover, environmental and technical challenges such as limited communication range and poor visibility underwater make development arduous, ensuring that autonomous vehicles complement rather than replace traditional naval forces in securing the ocean floor.