Key Points – The Russian Sierra II-class (Project 945A “Kondor”) is an advanced nuclear-powered attack submarine designed as a hunter-killer to target US and NATO submarines.
-Its most distinctive feature is a full titanium pressure hull, which, while extremely expensive, allows for exceptional diving depth (over 500 meters), speed (up to 32 knots submerged), and a low magnetic signature.
-Armed with a versatile mix of torpedoes and anti-submarine/cruise missiles, only two of these potent boats were ever built—the Pskov and Nizhny Novgorod.
-Despite their small numbers, they remain a significant and dangerous threat within Russia’s Northern Fleet.
Russia’s Titanium Sub: Meet the Sierra II-Class
The Sierra II Class submarines were an advanced derivative of the Sierra-I class.
Despite being based on the Sierra-Class, the Sierra-II makes several design changes over its predecessor. These Russian nuclear attack subs were designed for search-and-destroy missions against American subs.
Despite their small numbers, the Seirra-II represents a real and dangerous threat to NATO subs due to their speed, advanced sonar suite, and their stealth characteristics.
From Sierra-I to Sierra-II
The original Sierra-class submarines were developed during the Cold War, a time of intense military competition between the United States and the Soviet Union. The Soviet Navy sought to counter the growing threat that American ballistic missile submarines and carrier strike groups posed.
To achieve this, they developed a new generation of nuclear-powered attack submarines capable of operating at greater depths, with higher speeds and lower acoustic signatures.
The result was the Sierra-class, which came in two main variants: Project 945 “Barrakuda” (Sierra I) and the more advanced Project 945A “Kondor” (Sierra II). The Sierra II was a significant upgrade over its predecessor, incorporating improved sonar systems, quieter propulsion, and enhanced weaponry. The first Sierra II submarine was laid down in the late 1980s and commissioned in the early 1990s.
Specs and Capabilities
The Sierra-II class shares the same titanium pressure hull as its predecessor, the Sierra-I. Titanium is usually not used in submarine construction as it is expensive and hard to work with, but it offers several advantages. Its high strength-to-weight ratio allows the submarine to dive deeper than those with steel hulls. It is also highly resistant to corrosion, which extends the operational life of the hull, and it has a reduced magnetic signature, making the submarine harder to detect by magnetic anomaly detectors.
The Sierra II-Class features a double-hull design, with a space between the inner pressure hull and the outer hydrodynamic hull. This configuration enhances survivability and allows for better noise insulation.
In terms of size and performance, the Sierra II measures approximately 110 meters in length, with a beam of 14.2 meters and a draft of 8.8 meters. It displaces around 7,600 tons when surfaced and 9,100 tons when submerged. The submarine can reach up to 32 knots while submerged and is believed to be capable of diving to depths exceeding 500 meters. It is powered by a single OK-650 pressurized water reactor, which generates 190 megawatts of thermal power.
This reactor provides the submarine with virtually unlimited range, limited only by the endurance of its crew and the need for maintenance. The typical crew complement is around 72 personnel.
Why the Kondor is a Threat to NATO
The Sierra II is equipped with a formidable array of weapons, making it a versatile platform for both anti-submarine and anti-surface warfare. It features four 650 mm and four 533 mm torpedo tubes, capable of launching a variety of torpedoes and missiles.
Among its missile systems are the SS-N-21 Sampson cruise missiles, as well as the SS-N-15 Starfish and SS-N-16 Stallion anti-submarine missiles. The submarine can also be configured to carry up to 42 naval mines instead of torpedoes. These weapons allow the Sierra II to engage various targets, from enemy submarines and surface ships to coastal installations.
Stealth is a critical attribute for any modern submarine, and the Sierra II was designed to be as stealthy as possible. The titanium hull not only allows for deeper dives but also contributes to acoustic quieting. The submarine is covered in anechoic tiles that absorb sonar waves, reducing its detectability. It is equipped with advanced sonar systems, including a spherical bow sonar array and flank arrays, which provide comprehensive underwater detection capabilities. The propellers are designed to reduce cavitation, further minimizing noise.
Deadly, But Few in Number
Only two Sierra II-class submarines were completed: K-336 “Pskov” (originally named “Zubatka”) and K-534 “Nizhny Novgorod” (originally “Okun”). Both submarines were assigned to the Russian Northern Fleet, operating primarily in the Arctic and North Atlantic regions. Their missions have included tracking NATO submarines, intelligence gathering, and testing new weapons and sonar systems. Despite their age, both submarines remain in service as of today, thanks to periodic upgrades and overhauls.
The Sierra-class submarines have had a relatively quiet operational history, but they are notable for several reasons. The use of titanium, while advantageous, also made the Sierra-class extremely expensive to build and maintain. This, combined with the collapse of the Soviet Union, led to the cancellation of further units, including a planned Sierra III variant (Project 945B “Mars”), which was scrapped before completion.
The Sierra II-class submarines are especially deadly as they were designed to hunt and destroy U.S. ballistic missile submarines. Their ability to operate at great depths and remain undetected made them ideal for this role.
Even today, the Sierra II remains a valuable asset for the Russian Navy, particularly in the Arctic, where its deep-diving capabilities and rugged construction are advantageous. While very few of these submarines exist, they are still a force to be reckoned with.
About the Author:
Isaac Seitz, a Defense Columnist, graduated from Patrick Henry College’s Strategic Intelligence and National Security program. He has also studied Russian at Middlebury Language Schools and has worked as an intelligence Analyst in the private sector.
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