Fault Detected in Cinia C-Lion1 Submarine Cable

A fault was detected in Cinia Oy's C-Lion1 submarine cable, connecting Finland and Germany, on Wednesday, December 25, 2024, at 6:44 p.m. 

The probable cause of the fault is considered to be a cable cut and the location is in the Gulf of Finland, southeast of Porkkalanniemi, approximately 60 kilometers from Helsinki.

As a result, all communication connections operating via the C-Lion1 cable between Helsinki and Rostock are currently down. The exact cause of the fault remains unknown, and investigations are ongoing.

Cinia has submitted a request for investigation to the National Bureau of Investigation (NBI) which is now overseeing the investigation and will provide updates on its progress.

Corrective measures have been initiated. Preparations are being made to dispatch a repair vessel to the fault site, although the exact timeline for restoring the cable has yet to be determined. Typically, repairs for submarine cables take several weeks.

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The article has been updated on Monday 30 December at 8:45 a.m. (EET)

The repair vessel Cable Vigilance left for the fault site on Sunday 29 December at 5:30 p.m. (EET) The current estimate is that the repair of the cable will be completed by 10th of January 2025.

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The article has been updated on Friday 3 January at 12:00 p.m (EET)

The cable repair vessel Cable Vigilance arrived at the fault site today, Friday 3 January at 9.30 a.m. (EET) and the repair work has started. Based on current information, the cable repair will be completed on schedule by 10 January 2025.

Media Contacts: 
Cinia Communications
communications@cinia.fi

C-Lion1 is a submarine telecommunications cable between Finland and Germany, owned by Cinia, with a length of 1173 kilometers. The submarine cable was commissioned in 2016 and connects Central European telecommunications networks to Finland and the other Nordic countries.

Cinia is a Finnish provider of security for digital environments and a specialist in critical, high reliability connectivity and software. Cinia delivers high-quality network, cybersecurity, and software solutions to both public and private sector customers. For more information: cinia.fi