The D-3 was a Soviet motor torpedo boat(MTB) design built before and during World War II. One boat was captured by the Finnsand operated by them before had to be returned to the Soviets after the Moscow Armistice in 1944. After the war, two vessels were exported to Poland in 1946.
In Black Sea the D3 class never operated in large numbers, only the original D-3 prototype was active alongside the steel-built SM-3 prototype. Both vessels were however quite active, sinking the italian midget submarine CB-5 and the German barge F-334 in 1942 , while SM-3 sank another barge in 1944 alongside G-5 boats during the Crimean offensive.

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