There is only one Typhoon Class submarine remaining in service in the Russian Northern Fleet. It’s the Dmitriy Donskov (TK-208). Technically it’s under the control of the Strategic Rocket Forces even though it’s under the command of the Russian Navy.
It’s a huge submarine with smaller sub-hulls existing within its massive titanium outer hull. It carries twenty SS-N-20 Sturgeon nuclear missiles. It came to the attention of the American public through Tom Clancy’s book and later film, “The Hunt for Red October“.
The Sturgeon missiles are being phased out and the refit costs of one Typhoon equal the entire cost of two new Dolgorukiy Class (also called Borei Class) nuclear missile submarines, so budgets and entropy are ending the Typhoon’s career.
The Typhoon was designed to sail out, clear its baffles and insure that no Western submarine was tracking it, and once under thick polar ice, to blow its ballast tanks partially so that it was positively buoyant and floated up under the ice – and remain there during its 120 day patrol. They were difficult to detect and would have been difficult to sink without using a nuclear warhead, once located.
Today Dmitriy Donskov the first of the Typhoon Class to be commissioned, is operating as a test platform for the new Bulava (SS-NX-32) missiles. She is no longer patrolling. Those duties have passed to other submarines.