The diesel-electric submarine is a so-called Project 636.3 or Varshavyanka class. It is the fifth out of six subs designed for the Black Sea Fleet. The vessel is armed with torpedoes and Kalibr cruise missiles and can strike objects at land, surface or under water.
The vessel can detect a target at a distance four times larger than its targets can find the sub. For its stealthiness, the US Navy dubbed such submarines "black holes in the ocean" as they are virtually undetectable when submerged.
