CHINA WATCHBaltic Subsea Sabotage: China Gets Away with Non-cooperation

By Jakub Janda and James Corera

On Christmas Day, one of two cables connecting Finland’s electricity grid to Estonia, Latvia and Lithuania was cut. Four data cables—three linking Finland and Estonia and one between Finland and Germany—were broken at the same time.

This and two earlier instances have heightened concerns about the vulnerability of Europe’s undersea infrastructure, prompting calls for enhanced security measures and international cooperation to safeguard critical communication and energy links.

It’s also a timely reminder to Indo-Pacific countries to think about how their region is similarly vulnerable to subsea sabotage.

Once could be an accident, and twice might be a coincidence. But three instances look like a trend that we shouldn’t ignore or tolerate, especially since we know malign actors like Beijing and Moscow also have the capability to disrupt our critical infrastructure through prepositioned malware.

Finnish authorities are investigating the outage. On 26 December, Finland used heavily armed elite units to board and forcibly detain a tanker, registered in the Cook Islands but in fact Russian, suspecting its crew had deliberately severed the cables. Finnish authorities say the tanker, which was carrying oil, is part of Russia’s effort to avoid international trade sanctions. The ship is also reported to have been equipped for listening to radio transmissions as an intelligence gatherer.

Finnish authorities could board the ship and arrest its crew without the consent of its owner or the country of registration only because it was in Finnish waters. But doing so still required Finland to have the political will to take bold action.

Several data cables and a pipeline connecting Finland and other Nordic countries to the European mainland have been severed in the past year in suspected deliberate anchor-dragging incidents. Jukka Savolainen, a Finnish navy officer and director of the European Center of Excellence for Countering Hybrid Threats, a body established by NATO and the European Union, has suggested publicly the high number of similar cable breaks shows that the perpetrators are testing whether cheap civilian ships can cause disruptions of critical infrastructure.

The latest Finnish incident follows the simultaneous severing of two undersea data cables in mid-November. The BCS East-West Interlink cable, connecting Gotland to Lithuania, was severed around 17 November, causing substantial disruptions to telecommunications services.

The next day, the C-Lion 1 submarine telecommunications cable, linking Helsinki to Rostock, Germany, was also cut. The damage was detected near the southern tip of Sweden’s Oland Island. The operator, Cinia Oy, said an external force had severed the cable.