Losos class submarine
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Project 865 Пиранья (NATO reporting name "Losos") is a Russian supersmall experimental submarine.
The Losos was designed for special operations and engaging surface ships located offshore, and is thus very durable and almost completely silent.
The hull is made of a titanium alloy, reducing the effectiveness of mines.
Only two Losos class submarines were built, the MS-520 and the MS-521. Launched in 1986 and 1990, respectively, they are in reserve but are expected to soon be discarded.