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Timeline of suspected underwater sabotage at Baltic Sea

After a series of power outages, as well as telecom and gas pipeline failures, the Baltic Sea region has been on high alert. NATO's military presence, including aircraft, frigates and naval drones, have increased.

The police in the region have determined that some incidents are caused by sabotage, while others may be accidental or still under investigation.

JANUARY: LITHUANIA - LATVIA CABLE

A?undersea cable connecting Sventoji, Lithuania, to Liepaja, Latvia, two coastal cities about 65 km (40 mile) apart was installed.

On?January 2. ?Latvian Police boarded a docked ship at Liepaja later and started criminal proceedings.

The police

On January 5, they reported that there was no evidence to link the ship with the damage to the cable belonging to Sweden's Arelion and that they were continuing to investigate the incident.

DECEMBER 2025: FINLAND-ESTONIA TELECOM CABLES, SWEDEN-ESTONIA CABLE

On December 31, the Finnish police seized a cargo ship en route to Israel from Russia on suspicion of sabotaging a undersea cable of Elisa that runs from Helsinki through the Gulf of Finland and into Estonia.

Police said that the Fitburg vessel was found with its anchor still in the water. Investigators discovered tracks which suggested it had been dragged for "several 10s of kilometers" along the seabed.

Investigators have said that the 14 crew members of the ship were all from Russia, Georgia and Kazakhstan, and one was in police custody, while three other were prohibited from travelling while an investigation is ongoing.

Arelion, a Swedish company, said one of their cables that runs from Finland to Estonia had also been damaged on December 31. A cable that ran from Estonia to Sweden ceased to work on December 30.

JANUARY - FEBRUARY 2025 - SWEDEN - LATVIA AND FINLAND - GERMANY TELECOM CABLING

A fibre-optic cable undersea connecting Latvia with Sweden's Gotland Island malfunctioned in January, prompting an investigation by NATO and the police. Sweden seized the bulk vessel Vezhen, which was flagged in Malta. It suspected that the damage had been caused by gross sabotage.

Navigation Maritime Bulgare, a Bulgarian shipping company, said that Vezhen's Anchor may have fallen in high winds and struck the cable but denied sabotage. Later, a Swedish prosecutor ruled that the break was accidental and released vessel.

CABLES FOR POWER AND INTERNET IN DECEMBER, 2024

On December 25, four telephone lines and the Estlink 2 underwater power cable, which connects Finland to Estonia, were cut.

Finland has seized the Cook Islands Eagle S tanker, on suspicion that it was responsible for the damage caused by its anchor dragging. The ship is also suspected of being part of an "shadow fleet" to circumvent Russian oil sanctions. The Kremlin has dismissed any concerns over the seizure.

A Finnish court dismissed the case in October 2025 against Eagle S's captain and crew due to a lack of evidence.

BALTIC TELECOM CABLES: NOVEMBER 20, 2024

On November 17 and 18 two undersea fiber-optic communication cables, located in the Baltic more than 200 km (about 100 nautical miles) apart were cut. This raised suspicions about sabotage.

The investigators focused on the Chinese bulk carrier Yi Peng 3. An analysis of MarineTraffic showed that the coordinates of the ship matched the time and location of the breaches.

On December 21, China allowed investigators from China, Germany, Sweden,?Finland, and Denmark to board the Yi Peng 3 with Chinese representatives. Swedish investigators found no conclusive evidence of wrongdoing.

BALTICCONNECTOR - GAS PIPE & CABLES OCTOBER 20, 2023

On October 8, 2023, a?subsea-gas pipeline, the Balticconnector that links Finland and Estonia was severed when a Chinese container ship, NewNew Polar Bear, dragged its anchor.

The Estonian Police suspected that the ship had also damaged telecoms cables linking?Estonia with Finland and Sweden between October 8-9, before striking the gas pipeline while on its way to St Petersburg in Russia.

The captain of the ship appeared in court in Hong Kong 2025, accused of "criminal damages" to cables and pipelines.

SEPTEMBER: NORD STREAM BLASTS

In September 2022, explosions damaged Nord Stream 1 & Nord Stream 2 which were built by Russia's Gazprom across the Baltic Sea to?pump gas into Germany.

Western officials have suggested that Russia has blown up its own pipelines. This interpretation is rejected by Moscow which blames the United States of America, Britain, and Ukraine for these explosions which largely cut off Russian gas from the European Market.

These countries denied any involvement. Reporting by Anne Kauranen, Essi Lahto, Terje Solsvik, Johan Ahlander, Stine Jacobsen, Andrius Sytas, Anna Ringstrom, Simon Johnson, and Agnieszka Olesnak, Elviira Louma, and Jagoda Dallak, in Gdansk. Editing by Alex Richardson.

(source: Reuters)