Fingrid, the operator of Finland’s national grid, said Estlink 2 remained out of service but that the damage “did not endanger the operation of the electricity system” in the country.
Repairs are expected to take “several months”.
“From our side we are investigating grave sabotage,” said Robin Lardot, director of Finland’s National Bureau of Investigation (NBI).
President Alexander Stubb posted on X that he had been given an “overview” of the cable breach from authorities.
He underlined the need to “avert the risks” posed by vessels that are part of the shadow fleet.
Finnish police have said the case is being investigated as “aggravated criminal mischief”.
The damaged cable had a transmission capacity of 650 megawatts and is 170km long (105 miles), 145km of which is submerged. The fault was located on Thursday in the submarine section.
