The Sierra II (Project 945.A - Кондор/Kondor) class has a considerably larger sail which is 16.5 ft (5.0 m) longer than the Sierra I type. The sail also has a curious flat, square leading edge. The masts are offset on the starboard side to make way for two escape pods in the sail. The starboard side also has a 10-point environment sensor fitted at right angles to the front end of the sail. Also, the Sierra II type has a much larger pod on its after fin. The pod houses the Skat 3 passive very low frequency towed array.
In October 2012 a Sierra II class submarine carried out a patrol off the US East coast.
Submarines in class:
- B-534 Nizhniy Novgorod - commissioned Dec 1990, active
- B-336 Pskov - commissioned 1993, active
Read more about this topic: Sierra Class Submarine