Forbes

An Oscar-II class nuclear-powered cruise missile submarine was seen entering the Baltic early Thursday. Russia normally only deploys diesel-electric submarines to the area. While these are potent, and can carry a few long range cruise missiles, the arrival of the OSCAR-II is a massive increase in Russian Navy firepower. So when one turns up it gets noticed by NATO and the Baltic States.

Its arrival was monitored by open-source intelligence analysts. As it passed under the Great Belt Bridge which spans the entrance of the Baltic, it had to do so on the surface, so it was briefly visible on the public webcams on the bridge. OSINT analysts shared the information and identified the submarine.

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