On a cold Christmas morning in 2024, Estonia's power supply took a hit. The Estlink 2 cable, connecting them to Finland, unexpectedly failed. This left Estonia with only one operational cable, losing nearly two-thirds of its power supply. Although it didn't disrupt services immediately, experts feared a rise in energy prices while the cable remained offline. The next day, Finnish officials detained a tanker that had been passing over the cable, suggesting it might have damaged it while dragging its anchor.

This wasn't the first such incident. Estonia's defense minister, Hanno Pevkur, noted similar suspected "hybrid attacks" in recent months. Within three weeks, NATO deployed a coordinated group of warships to the Baltic Sea to deter such attacks. NATO Secretary General Mark Rutte expressed grave concern about the growing threat to critical undersea infrastructure.

Undersea drones and AI now help monitor the situation. Warships from various NATO countries joined the mission, including Germany, the Netherlands, and Sweden. French Armed Forces Minister Sébastien Lecornu denounced aggressive Russian actions during the mission, including GPS jamming and radar lock-ons.

The Baltic Sentry operation, backed by AI run from NATO's Maritime Centre in the UK, aims to quickly spot anomalies like ships loitering near critical cabling. Despite the speed and advanced resources, attributing blame remains challenging. Pevkur cautioned about falling into a trap of quick conclusions, stressing the need for solid evidence.

Undersea drones play a pivotal role in the operation, scanning the ocean floor and relaying images to operators who watch for damages. If irrefutable evidence of Russian involvement is found, NATO could move closer to confronting its adversary.

Undersea Cables and NATO: Protecting the Baltic's Hidden Highways

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