Rostock

"It's really very interesting work and quite impressive," says Friedemann Reinhard at the University of Rostock in Germany, who was not involved in the work.

The following day, the C-Lion 1 cable between the Finnish capital Helsinki and the German port of Rostock was severed.

The latest incident involves a C-Lion1 fibreoptic cable linking the Finnish capital, Helsinki and the German city of Rostock.

In March 2023, German media reported that a pro-Ukraine group was involved in the sabotage using a vessel and setting off from the German port of Rostock.

“Everybody thought these structures are vestigial — so without any function,” said Guido Dehnhardt, a marine mammal zoologist at the University of Rostock in Germany.