Two of the data links are marine cables operated by Elisa, running between Helsinki and Tallinn, Estonia. One also running from Helsinki to Tallinn is owned by the Chinese-owned CITIC Telecom.

The fourth cable is Cinia's C-Lion1 submarine cable, which connects Helsinki to Germany. Finnish state-owned company Cinia has pinpointed the damage to its cable southeast of the Porkkala peninsula, just west of Helsinki on the Gulf of Finland.

According to the Finnish Transport and Communications Agency (Traficom), Elisa's cables have been severed, and two other cables have sustained damage.