"Prozorlivy" served over seven years in the Finnish navy. During her first years, she supported British operations against the Bolshevik navy. In accordance with the Treaty of Tartu of 1920, three of the "Sokol" class ships were returned to the Soviet Union in 1922. It was also planned that "Prozorlivy" would have been handed over, but the ageing ship was sold to Finland, where she was included in the Finnish navy. "Prozorlivy" was renamed "S2" in 1922 and she continued to serve the fleet until 4 October 1925, when she was lost at sea with all hands. The loss of "S2" is the worst peacetime accident in the Finnish navy and it shocked both the navy and the country. The disaster was a major catalyst for a large renewal program of the Finnish fleet.