Second sighting of Sweden's suspicious submarine

Sweden's military has confirmed a second sighting in October of what appeared to have been a submarine in waters near Stockholm city centre, not long after a search had been launched for a suspected Russian submarine off the coast.

In November, the Swedish military released images of tracks on the sea bed and an apparent submarine periscope which it said proved that "a mini submarine violated Swedish territory" between October 17 and October 24 and that "at least one vessel" was involved.

However, despite widespread speculation that the submarine was Russian, the military never identified its nationality.

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