On July 13, 2024, a Russian submarine reportedly blocked a ferry route near Bornholm Island, Denmark, indicating hostile undersea activity in regional waters.

On July 13, 2024, a Twitter thread by user @balticjam reported that a ferry route from Bornholm, an island belonging to Denmark, was blocked by a Russian submarine. The incident suggests the use of underwater military tools to disrupt maritime traffic and exert covert pressure near Danish territorial waters. Although detailed operational specifics were not provided, this action points to an aggressive Russian naval tactic impacting regional security and freedom of navigation in the Baltic Sea. The event aligns with Russia's pattern of undersea operations intended to intimidate and control access points around the Baltic region.