All Hotels were decommissioned between 1987 and 1991.
The successor to the Hotel-class was much more capable. Yankee-class subs were of a new design with a contoured hull designed to minimize resistance. Thirty-four were built between 1964 and 1974.
They were armed with six torpedo tubes and 16 silos capable of launching newer R-27 SLBMs. In 1977, one Yankee-class sub, K-140, was converted to a test platform for larger SLBMs. With 12 silos, it was designated “Yankee II.”
Yankee-class subs gave the Soviet Union its first reliable platform for nuclear-armed patrols just outside the territorial waters of its NATO rivals.
But the class did face setbacks. In 1986, sea water leaked into a missile silo aboard K-219, mixing with missile fuel and causing an explosion. Four sailors were killed, and the sub was lost as it was towed back to Soviet territory.
Between 1979 and 1994, the missile silos aboard all Yankee-class boats were rendered inoperable in order to comply with various arms-control agreements. Many were converted for different uses, including for intelligence-gathering and as cruise-missile and attack submarines.
By 1995, all Yankee-class boats had been decommissioned.
Deltas and Typhoons
In 1972, the Soviet Navy commissioned its first Delta-class SSBN. With four total subclasses, the Deltas formed the backbone of the Soviet and Russian SSBN fleet for decades.
Armed with the R-29 Vysota family of missiles, which have ranges of 4,000 to 5,000 miles and carry multiple independently targetable reentry vehicles (MIRVs), the Deltas had a massive advantage over their predecessors in that they could patrol much farther from NATO countries than previous Soviet SSBNs and still be an effective deterrent. This was particularly true deep in the Arctic.
Developed in response to the US Navy’s Ohio-class SSBNs, the Typhoons each displace roughly 48,000 tons — the same as some World War II battleships. They were so large that a sauna, swimming pool, and gym could be installed. They were also capable of 120-day deployments.
Armed with 20 R-39 Rif SLBMS with as many as 10 MIRVs each, a single Typhoon can launch as many as 200 nuclear warheads at targets over 5,000 miles away.
Their massive size wasn’t just for intimidation. Intended primarily to patrol in the arctic, Typhoons needed to be able to break through thick ice at a moment’s notice. Their Delta- and Yankee-class predecessors had to find weaker sections of ice if they needed to surface.
After the Soviet Union dissolved in the 1990s, the Deltas and Typhoons became too expensive to fully maintain, and many were decommissioned.
Only the seven Delta IVs remain in service with the Russian Navy. One of them, Podmoskovye, was converted into a special-mission submarine in 2016 and now conducts intelligence missions. Only one Typhoon boat, Dmitriy Donskoy, is still in service.
The first Borei-class boat, Yury Dolgorukiy, was designed during the Cold War, but its construction didn’t begin until 1996, and it wasn’t commissioned until 2013.
Each Borei-class boat has six torpedo tubes and 16 silos capable of launching the new RSM-56 Bulava SLBM, which has a range of over 5,000 miles. Each Bulava can carry between six to 10 MIRVs with payloads ranging from 100 to 150 kilotons.
Despite being smaller than the Typhoons, the Borei’s are considered the most advanced SSBNs Russia has ever built. They have new electronics and control systems and a pump-jet propulsion system that makes it much quieter than its predecessors.
Because of design changes made during construction delays, there is now a subclass designated Borei-A. These boats are slightly larger and have even more advanced tech.
The Russian Navy plans to have 10 Boreis in service by the end of the decade.
Benjamin Brimelow is a reporter at Business Insider.