Sierra Class Submarine
The Sierra I class (NATO reporting name) or Project 945 (Барракуда/Barrakuda) nuclear submarine was the Soviet Union's successor class to the partly successful Project 705 Lira (Alfa) class submarine. The Sierra class has a light and strong titanium pressure hull which enables the class to dive to greater depths, reduce the level of radiated noise and increase resistance to torpedo attacks.
The Sierra II class (NATO reporting name) or Project 945A (Кондор/Kondor) nuclear submarine was a successor to the Sierra I with improved quieting and sonar.
Read more about Sierra Class Submarine: Sierra I, Sierra II, Sierra III (provisional)
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