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STORY: Hours after two communication cables were severed in the Baltic Sea, one of northern Europe’s largest ever naval exercises got underway. 30 NATO vessels and 4,000 military staff took to the water for the 12-day 'Freezing Winds' drill.NATO is making a push to boost its protection of infrastructure in these waters…Which are seen as increasingly vulnerable to attack.The Baltic Sea, which carries 15% of global shipping, is bordered by eight NATO countries and Russia. There are around 40 telecommunication cables and critical gas pipelines that run along its relatively shallow seabed.Since 2022, when Russia invaded Ukraine, there have been at least three incidents of possible sabotage.But the ease with which an anchor slices through cables, coupled with often-treacherous sea conditions, makes the prevention of attacks impossible. And NATO exercises face weather challenges; German navy commander Beata Krol launched a drone to view the seabed and it quickly froze. In the latest incident, security sources said a Chinese bulk carrier, which had left Russia, severed two undersea cables by dragging its anchor. China has said it's ready to assist in the investigation - while Russia has denied involvement.Cable damage is not new.But if any of the recent incidents are proven to be sabotage, it’d mark a return of a type of warfare not seen for decades. NATO is repurposing its World War Two mine-hunting fleet to monitor suspicious underwater activity - as well as using sonar and specialist divers. But for now, its powers are still limited.