A Russia-linked tanker, Eagle S, was seized by Finland for damaging an undersea cable, and it was found to have spying equipment on board. The equipment was used to monitor NATO naval and aircraft activities, and it was installed in addition to the ship's normal systems. The ship's power generator was strained by the equipment, leading to repeated blackouts. The incident has raised concerns about the use of merchant ships for spying and sabotage activities in the Baltic Sea.