Russia builds world's longest submarine. K-329 Belgorod. YouTube
St Petersburg

Belgorod: Russia’s submarine is making waves

On April 23, 2019, a ceremony was held at the arsenal of Severodvinsk, the Russian naval base on the White Sea in the Archangel Oblast, for the new nuclear-powered submarine destined for special missions.

Published: November 27, 2019, 7:47 am

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    The K-329 Belgorod (project 09852) has become part of the 29th Autonomous Brigade of the Northern Fleet, but it is in effect dependent on the Glavnoe Razvedyvatel’noe Upravlenie or the Russian military information service.

    The sub was designed to act as a “mother ship” for other smaller submarines, such as Losharik, and above all it can carry the new retaliatory weapon of Russia: the Poseidon nuclear-powered torpedo, capable of destroying a city by generating an artificial tidal wave with its atomic charge of two megatons.

    And the Belgorod is by far larger than anything operated by any other naval force, including the US.

    The modified sub is derived from what is known in the West as the Oscar II class (Project 949A Antey in Russia) but the submarine, as already mentioned, is very different from those belonging to this class of SSGN type naval units.

    First the hull is larger: its dimensions are 178 meters (compared to the 154 of the Oscars II and longer then the old Typhoon classes) in length by 15 meters of maximum width (narrower than three meters), with a total displacement, under water, of 24 000 standard tons (30 000 at full load) instead of, respectively, 16 400 and 24 000 of the other units.

    The propulsion is of a nuclear type assured by two pressurized water reactors of the type OK-650M.02 capable of delivering a power of 190 megawatts each, through two steam turbines, to two propellers of new design that should guarantee the submarine’s almost complete silence.

    It is believed that the maximum speed is less than 32 knots and that the operating depth is the same as the SSGN from which it derives, ie around 500/520 meters. The estimated crew is more numerous than the Oscars II: 110 men instead of 94.

    The most important changes are the elimination of the compartment with launch tubes for cruise missiles to make room for a new sector, about 18 meters long, able to accommodate submarines for special operations such as the Losharik or the Paltus. And at the bow – this is also longer than a normal one of an Oscar II class – there is a new compartment (38 meters long) that serves to operate with the new nuclear-powered atomic Poseidon torpedoes. The Belgorod in fact, has six rotating torpedo tubes – as in a revolver gun – able to accommodate them.

    Simply put, the submarine will be armed with largest torpedoes in the world with atomic propulsion systems.

    This transformation project started in 2010 while the actual construction officially started in 2012. The submarine, along with other units for special tasks, operates on behalf of GUGI, the Chief Directorate for Deep Marine Research. To carry out espionage operations, mapping of the seabed and sabotage, the Belgorod was designed to accommodate the entire range of underwater minisubs and drones (UUV – Unmanned Underwater Vehicle) in service in the Voenno-morskoj Flot (the Russian Fleet).

    The Poseidon atomic warhead and nuclear propulsion torpedo was already known as Kanyon or Status-6. Developed by the Rubin design bureau of St. Petersburg, the torpedo is about 24 meters long with a diameter of 2 (estimated).

    The atomic propulsion is provided by a small 8 megawatt liquid metal cooled reactor which allows it to hold a cruising speed of around 30 knots – equal to 55 km/h – but with acceleration speeds up to 70 knots, equal to 130 km/h (the first estimates of maximum speed equaling 100 knots were later denied).

    The range, despite the nuclear reactor, could be between 10 000 – 11 500 km, but some believe it is unlimited.

    If these characteristics were confirmed it would mean that the Poseidon would be very difficult to intercept for Western naval forces: the torpedo currently supplied to the US Navy – the Mk-48 – has in fact a maximum range of 55 km and can reach a depth of only 800 meters.

    It would be interesting to know what kind of navigation tools there are on board, but for the moment analysts can only make assumptions based on deductive reasoning: if the Poseidon has the possibility to accelerate automatically to evade enemy attacks it is reasonable to suppose that it is equipped active/passive sensors to change their navigation profile to avoid enemy torpedoes.

    Secondly it could be that, given the very long range that would allow it to be launched from the waters adjacent to Russia and given the operational depth of 1000 meters, the navigation instruments are inertial with the help of preset maps and data supplied by the submarine at the time of launch.

    It is believed that the giant Russian sub is able to also have a mission profile different from that which foresees the launch from a submarine. Some analysts believe that the Poseidon can be carried by a support vessel and remain waiting to take action by standing still on the seabed.

    The torpedo, according to unconfirmed American sources, could also have the possibility of being equipped with a cobalt-60 casing for the warhead, a particularly radioactive artificial isotope (its half-life is 5,7 years) that would kill all life by contaminating the environment with high values ​​of radiation for about 10/20 years, but that could spread on a large scale given the power of the bomb that would generate a tsunami that would submerge American coastal cities.

    Given the characteristics of the weapon system, it makes it the perfect instrument of retaliation. The Poseidon could, in fact, overcome the American and NATO defenses by being launched from seas contiguous with Russia, allowing the naval units to remain in friendly waters sheltered from hostile activity.

    The torpedo would proceed in its race towards the targets managing to hit a city like New York starting from Murmansk after 36 hours thus becoming a weapon of retaliation, or of second strike, against which there would be no defense. However, the strategic concept of a weapon of this type is not new, having been conceived by Andrei Sakharov in the 1950s in the Soviet Union.

    Russia currently has a second unit under construction with tasks similar to Belgorod but derived from a different class of submarines: the Khabarovsk (project 09851) similar to the new Borei class but shorter than this which theoretically should have six Poseidon torpedoes as equipment to enter service not before 2020.

    The Khabarovsk is estimated to be 120 meters long by 13 meters wide (for the main hull) therefore with a displacement of 10 000 tons on the surface. It too will be nuclear-powered with a reactor that will probably be of the ОК-650В type capable of pushing it at a speed certainly higher than 20 knots by means of a single propeller in axis.

    We do not know the number of crew members and can only estimate its operational depth (between 400 and 500 meters), but from the preliminary drawings it emerges that the Khabarovsk will have two lateral protuberances on the hull which will probably serve to house the Poseidon torpedoes.

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