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{{Short description|Class of Russian nuclear powered ballistic submarines}}
{{DISPLAYTITLE:Delta-class submarine}}
[[File:Submarine Delta IV class.jpg|thumb|300px|A Delta IV-class nuclear-powered ballistic missile submarine]]

{{external media
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The '''Delta class''', ([[Russian language|Russian]]: Дельта) [[List of ships of Russia by project number|Soviet designations]] '''Project 667B ''Murena'', Project 667BD ''Murena-M'', Project 667BDR ''Kalmar'', Project 667BDRM ''Delfin''''', ([[List of NATO reporting names for submarines|NATO reporting name]]s '''Delta I, Delta II, Delta III, Delta IV''' respectively) are a family of [[Nuclear submarine|nuclear-powered]] [[ballistic missile submarine]]s, designed and built in the [[Soviet Union]], which formed the backbone of the Soviet and Russian strategic submarine fleet since their introduction in 1973. They carry nuclear ballistic missiles of the [[R-29 Vysota]] family, with the Delta I, Delta II, Delta III and Delta IV classes carrying the R-29/[[R-29 Vysota|SS-N-8 'Sawfly']], R-29D/SS-N-8 'Sawfly', R-29R/[[R-29 Vysota|SS-N-18 'Stingray']] and [[R-29RM Shtil|R-29RM]]/SS-N-23 'Skiff' (and later on [[R-29RMU Sineva|improved]] [[R-29RMU2 Layner|versions]]) respectively.

The Soviets viewed the Deltas as an iterative improvement of the [[Yankee-class submarine]]s, which carried [[R-27 Zyb]] missiles with a range of {{convert|2500|-|3000|km|mi|abbr =on|0}}. The R-29s gave the Deltas much needed [[standoff distance]]; with a range of {{convert|7700|km|mi|abbr=on|0}} the Deltas were able to perform their [[Deterrence theory|deterrence patrols]] within relative safety of the [[Arctic Ocean]], while the Yankee-class had to patrol off the US coastline to do so. The Deltas were supplemented by the largest submarines ever built, the {{sclass2|Typhoon|submarine|1}}s, which served as guarantors of the Soviet [[second strike]] capability. The earlier Delta boats remained in service until the 1990s, when the [[Dissolution of the Soviet Union|Soviet Union ceased to exist]] and many classes of submarines were decommissioned due to the severe [[Austerity|budget cuts]] that resulted. A few Delta-IIIs and all of the Delta-IVs were retained by the nascent [[Russian Navy]].

34 boats were built and commissioned during 1972–1990; approximately five or six remain active in 2023. A handful were converted into special-purpose submarines operated by [[Main Directorate of Deep-Sea Research|GUGI]].<!-- sources in this article are sketchy and outdated; but up-to-date sources have been requested in the article body. -->

==Development==
In the 1960s the Soviet Navy wanted new submarine-launched nuclear missiles that could threaten targets in North America without their launch platforms needing to pass the [[SOSUS]] sensors in the [[GIUK gap]] to be within range.<ref>{{cite web |url=http://www.navy.mil/navydata/cno/n87/history/cold-war-asw.html#PhaseIV |title=The Third Battle: Innovation in the U.S. Navy's Silent Cold War Struggle with Soviet Submarines |first=Dr. Owen R. |last=Cote |date=March 2000 |website=U.S. Navy |access-date=2014-02-02 |archive-url=https://web.archive.org/web/20060410054823/https://www.navy.mil/navydata/cno/n87/history/cold-war-asw.html#PhaseIV |archive-date=2006-04-10 |url-status=dead}}</ref> The resulting project was an iterative improvement of the [[Yankee-class submarine|Project 667A ''Navaga'']]; The 667B could accommodate larger, more capable missiles within its enlarged dorsal hump.

==Delta I (Project 667B ''Murena'') 18 boats==
{| {{Infobox ship begin
| display title = none
}}
{{Infobox ship image
| Ship image = Delta I class SSBN.svg
| Ship image size = 300px
| Ship caption = A Delta I-class submarine
}}
{{Infobox ship class overview
| Name = Delta I class
| Builders = *[[Amur Shipbuilding Plant|Komsomolsk-on-Amur]]
*[[Sevmash|Severodvinsk]]
| Operators = [[Soviet Union]]
| Class before = {{sclass2|Yankee|submarine|4}}
| Class after = Delta II class
| Subclasses = 
| Cost = 
| Built range = 1965-?
| In service range = 1972-2004
| In commission range = 
| Total ships building = 
| Total ships planned = 
| Total ships completed = 18
| Total ships cancelled = 
| Total ships active = 
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 18
| Total ships preserved = 
}}
{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship type = 
| Ship displacement = *'''Surfaced:''' 7,800 tons
*'''Submerged:''' 10,000 tons
| Ship length = {{convert|139|m|ft|abbr=on}}
| Ship beam = {{convert|12|m|ftin|abbr=on}}
| Ship height = 
| Ship draught = {{convert|9|m|ftin|abbr=on}}
| Ship draft = 
| Ship ice class = 
| Ship power = 
| Ship propulsion = 2 pressurized water-cooled reactors powering 2 steam turbines driving 2 shafts and each developing {{convert|38.7|MW|shp|abbr=on}}
| Ship speed = *'''Surfaced:''' {{convert|12|kn|lk=in}}
*'''Submerged:''' {{convert|25|kn}}
| Ship range = Unlimited, except by food supplies
| Ship endurance = 
| Ship test depth = 
| Ship complement = 120
| Ship sensors = 
| Ship EW = 
| Ship armament = * D-9 launch tubes for 12 R-29 (SS-N-8 Sawfly) SLBMs
* 4 × {{convert|533|mm|in|abbr=on|0}} torpedo tubes
* 2 × {{convert|400|mm|in|abbr=on|0}} torpedo tubes
| Ship notes = 
}}
|}

The '''Project 667B ''[[Moray eel|Murena]]''/Delta I submarines''' could deploy on combat patrols in the marginal [[sea ice]] of the [[Russian Arctic|Soviet Arctic]] [[littoral|coastal zone]], and often patrolled in the [[Norwegian Sea|Norwegian]] and [[Barents Sea]]s. Consequently, unlike their predecessors, they no longer needed to pass through Western [[SOSUS]] [[sonar]] barriers to come within range of their targets. To improve the accuracy of the missiles, the Delta I-class submarines carry the [[Tobol-B]] navigation system and the [[Cyclone-B]] satellite navigation system.

After construction was authorized in 1965, the first Delta I, {{ship|Soviet submarine|K-279||2}}, was [[Ship commissioning|commissioned]] into the Soviet [[Soviet Red Banner Northern Fleet|Northern Fleet]] on 22 December 1972. A total of 18 submarines of this class were built, and all served the [[Soviet Navy]].

In [[Dissolution of the Soviet Union|1991]], nine Delta I-class submarines were still in active service. Their [[Ship commissioning#Ship decommissioning|decommissioning]] began in 1994, with removal of the missile compartments scheduled by 1997. All submarines of this class were taken out of service by 2004 and were [[Ship breaking|scrapped]] by 2005. The last active submarine of this project was the K-447 Kislovodsk, which was in service for more than 30 years and was decommissioned on March 5, 2004.<ref>{{cite web |title=Проект 667Б "Мурена" (NATO – "Delta"). |url=http://www.deepstorm.ru/DeepStorm.files/45-92/nbrs/667B/list.htm |website=deepstorm.ru |publisher=DEEP STORM |access-date=9 January 2024}}</ref>

The 400 mm tubes carry either the MG-44 swimming noise-simulation [[sonar decoy]] or the SET-40 anti-submarine torpedo.<ref>{{cite web |title=Nuclear-powered ballistic missile submarines - Project 667B |url=https://russianships.info/eng/submarines/project_667b.htm |website=russianships.info}}</ref>
{{Clear}}

==Delta II (Project 667BD ''Murena-M'') 4 boats==
{| {{Infobox ship begin
| display title = none
}}
{{Infobox ship image
| Ship image = Delta II class SSBN.svg
| Ship image size = 300px
| Ship caption = A Delta II-class submarine
}}
{{Infobox ship class overview
| Name = Delta II class
| Builders = [[Sevmash|Severodvinsk]]
| Operators = [[Soviet Union]]
| Class before = Delta I class
| Class after = Delta III class
| Subclasses = 
| Cost = 
| Built range = 1964-1974
| In service range = ?-1996
| In commission range = 
| Total ships building = 
| Total ships planned = 
| Total ships completed = 4
| Total ships cancelled = 
| Total ships active = 
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 4
| Total ships preserved = 
}}
{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship type = 
| Ship displacement = * '''Surfaced:''' 9,350 tons
* '''Submerged:''' 10,500 tons
| Ship length = {{convert|155|m|ftin|abbr=on}}
| Ship beam = {{convert|12|m|ftin|abbr=on}}
| Ship height = 
| Ship draught = {{convert|9|m|ftin|abbr=on}}
| Ship ice class = 
| Ship power = 
| Ship propulsion = 2 pressurized water-cooled reactors powering 2 steam turbines driving 2 shafts each developing {{convert|41|MW|shp|abbr=on}}
| Ship speed = * '''Surfaced:''' {{convert|12|kn}}
* '''Submerged:''' {{convert|24|kn}}
| Ship range = Unlimited, except by food supplies
| Ship endurance = 
| Ship test depth = 
| Ship complement = 130
| Ship sensors = 
| Ship EW = 
| Ship armament = * D-9D launch tubes for 16 R-29D SLBMs
* 4 × {{convert|533|mm|in|abbr=on|0}} torpedo tubes
* 2 × {{convert|400|mm|in|abbr=on|0}} torpedo tubes
| Ship notes = 
}}
|}
The '''667BD ''Murena-M''/Delta II submarines''' were designed to remedy the shortcomings of the Delta I submarine. The  planform was largely the same, but the submarine was lengthened in the fourth and fifth compartments by {{convert|16|m|ft|sp=us}} to allow the installation of four more missile tubes. The Delta-IIs also received additional quieting measures such as mounting the [[steam turbine]]s on shock absorbers, having all pipes and hydraulics separated from the hull through [[Soundproofing|rubber insulation]], and a special [[Anechoic tile|hydroacoustic coating]] being applied to the hull.{{Citation needed|date=May 2010}}

Only four submarines of this class were built between 1964 and 1974, apparently in favor of building the following class, the Delta III, and all Delta IIs were out of service by 1996.<ref>{{Cite web |last=Carlin |first=Maya |date=2024-02-20 |title=Russia's Delta II-Class Submarines Had Just One Mission |url=https://nationalinterest.org/blog/buzz/russias-delta-ii-class-submarines-had-just-one-mission-209549 |access-date=2024-06-06 |website=The National Interest |language=en}}</ref>

[[File:Delta-II class nuclear-powered ballistic missle submarine 2.jpg|thumb|left|Delta-II-class, 1997]]

{{Clear}}

==Delta III (Project 667BDR ''Kalmar'') 14 boats==
{{Main|Delta III-class submarine}}
{| {{Infobox ship begin
| display title = none
}}
{{Infobox ship image
| Ship image = Delta III class SSBN.svg
| Ship image size = 300px
| Ship caption = A Delta III-class submarine
}}
{{Infobox ship class overview
| Name = Delta III class
| Builders = [[Sevmash|Severodvinsk]]
| Operators = [[Soviet Union]], [[Russia]]
| Class before = Delta II class
| Class after = * {{sclass2|Typhoon|submarine|4}} & Delta IV class
| Subclasses = 
| Cost = 
| Built range = 1974-1982
| In service range = 1976-present
| In commission range = 
| Total ships building = 
| Total ships planned = 
| Total ships completed = 14
| Total ships cancelled = 
| Total ships active = 1
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 
| Total ships preserved = 
}}
{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship type = 
| Ship displacement = * '''Surfaced:''' 13,500 tons
* '''Submerged:''' 18,200 tons
| Ship length = {{convert|166|m|ftin|abbr=on}}
| Ship beam = {{convert|12.3|m|ftin|abbr=on}}
| Ship height = 
| Ship draught = {{convert|8.8|m|ft|abbr=on}}
| Ship power = 
| Ship propulsion = 2 pressurized water-cooled reactors powering 2 steam turbines delivering {{convert|44,700|kW|shp|abbr=on}} to 2 five-bladed fixed-pitched shrouded propellers.
| Ship speed = * '''Surfaced:''' {{convert|14|kn}}
* '''Submerged:''' {{convert|24|kn}}
| Ship range = Unlimited, except by food supplies
| Ship endurance = 
| Ship test depth = 
| Ship complement = 135
| Ship sensors = 
| Ship EW = 
| Ship armament = * 16 missiles
* 4 × bow {{convert|533|mm|in|abbr=on}} torpedo tubes
| Ship notes = 
}}
|}

The '''667BDR ''[[Squid|Kalmar]]''/Delta III-class submarine''' is a further development of Project 667, maintaining the double-hulled design with a thin, low magnetic steel outer hull wrapped around a thicker inner [[pressure hull]]. Development began in 1972 at the [[Rubin Central Design Bureau for Marine Engineering]].{{Citation needed|date=May 2010}} The submarine was the first that could launch any number of missiles in a single salvo, as well as the first submarine capable of carrying ballistic missiles with [[MIRV|multiple independently targetable reentry vehicles]]. The submarine carried 16 of the R-29R missiles each carrying 3 to 7 MIRVs, with a range of {{convert|6,500|to|8,000|km|abbr=on}}, depending on the number of re-entry vehicles.

As of 2023 two Delta-IIIs remain; [[Russian submarine Ryazan (K-44)|K-44 Ryazan]], and the heavily modified [[Russian submarine Orenburg (BS-136)|BS-136 Orenburg]].

==Delta IV (Project 667BDRM ''Delfin'') 7 boats{{anchor|Delta_IV_.28Project_667BDRM.2C_Delfin.29_7_boats}}==
{| {{Infobox ship begin
| display title = none
}}
{{Infobox ship image
| Ship image = Delta IV class SSBN.svg
| Ship image size = 300px
| Ship caption = A Delta IV-class submarine
}}
{{Infobox ship class overview
| Name = Delta IV class
| Builders = [[Sevmash|Severodvinsk]]
| Operators = [[Soviet Union]], [[Russian Federation]]
| Class before = Delta III & Typhoon classes
| Class after = {{sclass|Borei|submarine|4}}
| Subclasses = 
| Cost = 
| Built range = 1981-1992
| In service range = 
| In commission range = 1984-present
| Total ships building = 
| Total ships planned = 
| Total ships completed = 7
| Total ships cancelled = 
| Total ships active = 6
| Total ships converted = 1
| Total ships laid up = 
| Total ships lost = 
| Total ships retired = 
| Total ships preserved = 
}}
{{Infobox ship characteristics
| Hide header = 
| Header caption = 
| Ship type = 
| Ship displacement = 
| Ship length = 
| Ship beam = 
| Ship height = 
| Ship draught = 
| Ship ice class = 
| Ship power = 
| Ship propulsion = 2 pressurized water-cooled reactors powering 2 steam turbines with two fixed-pitched shrouded propellers.
| Ship speed = * '''Surfaced:''' {{convert|14|kn}}
* '''Submerged:''' {{convert|24|kn}}
| Ship range = Unlimited, except by food supplies
| Ship endurance = 
| Ship test depth = 
| Ship complement = 
| Ship sensors = 
| Ship EW = 
| Ship armament = *16 [[R-29RMU Sineva]] ballistic missiles; each with 4 [[Multiple independently targetable reentry vehicle|MIRV]] 
*4 × bow 533 mm (21.0 in) torpedo tubes
| Ship notes = 
}}
|}
Seven '''Project 667BDRM ''[[dolphin|Delfin]]''/Delta IV-class submarines''' were built, which were yet another iterative improvement of the Delta-class. All were retained and operated by the [[Russian Navy]]. The submarines, based at the [[Sayda Guba]] Naval Base, operate in the [[Northern Fleet]]. The [[Severodvinsk]] Shipyard built these vessels between 1981 and 1992. The last vessel completed was {{ship|Russian submarine|K-407 Novomoskovsk||2}}.

===Armament===
The Delta IV-class submarines employs the D-9RM launch system and carries 16 [[R-29RMU Sineva]] liquid-fueled [[missile]]s which each carry four independently targetable reentry vehicles ([[MIRV]]s). Unlike previous modifications, the Delta IV-class submarine is able to fire missiles in any direction from a constant course in a circular sector. The underwater firing of the ballistic missiles can be conducted at a depth of {{convert|55|m|sp=us}} while cruising at a speed of {{convert|6|-|7|kn}}. All the missiles can be fired in a single salvo.

The 667BDRM ''Delfin'' submarines are equipped with the TRV-671 RTM missile-torpedo system that has four bow-mounted torpedo tubes with a calibre of {{convert|533|mm|in|abbr=on|0}}. Unlike the Delta III-class design, it is compatible with all types of [[Type 53 torpedo|torpedoes]], [[RPK-6 Vodopad/RPK-7 Veter|anti-submarine torpedo-missiles]] and [[sonar decoy|anti-hydroacoustic devices]]. The battle management system Omnibus-BDRM controls all combat activities, processing data and commanding the torpedo and missile-torpedo weapons. The ''Shlyuz'' navigation system provides for the improved accuracy of the missiles and is capable of [[stellar navigation]] at periscope depths. The navigational system also employs two floating antenna buoys to receive radio messages, target destination data and satellite navigation signals at great depth. The submarines are also equipped with the Skat-VDRM hydroacoustic system.{{citation needed|date=January 2023}}

The Delta IVs executed [[Operation Behemoth]] ({{langx|ru|Бегемот}}) during the twilight of the Soviet Union; they remain the only class of SSBN to successfully fire its entire payload of ballistic missiles.

In 2011 K-84 ''Ekaterinburg'' successfully test-fired a new version of the SS-N-23 missile, reportedly designated [[R-29RMU2 Layner]]. The missile has improved survivability against anti-ballistic missiles.<ref>{{cite web |url=http://rusnavy.com/news/newsofday/index.php?ELEMENT_ID=13244 |title=Russian SLBM Liner Completed Flight Tests |website=RusNavy |date=2011-05-20 |access-date=2011-12-27 |archive-url=https://web.archive.org/web/20111230223829/http://rusnavy.com/news/newsofday/index.php?ELEMENT_ID=13244 |archive-date=2011-12-30 |url-status=dead}}</ref> Later on K-114 ''Tula'' conducted another successful launch.<ref>{{cite web |url=http://www.severnyflot.ru/news.php?extend.2375 |script-title=ru:Центр обновления |website=Severnyflot |access-date=2011-12-27 |language=ru |archive-url=https://web.archive.org/web/20120331014533/http://www.severnyflot.ru/news.php?extend.2375 |archive-date=31 March 2012 |url-status=dead}}</ref>

===Deployment===
Initially all the Delta IV-class submarines were based with the [[Russian Northern Fleet]] at [[Olenya Bay]]. All the submarines of this class serve in 12th Squadron (the former 3rd flotilla) of strategic submarines of the Northern Fleet, which now located in [[Gadzhiyevo|Yagelnaya Bay]].<ref>{{cite web |url=http://www.kommersant.ru/doc/856043 |script-title=ru:Северный флот |date=2008-02-25 |website=[[Kommersant]] |language=ru |access-date=13 April 2012 |archive-url=https://web.archive.org/web/20131030164244/http://www.kommersant.ru/doc/856043 |archive-date=30 October 2013 |url-status=live}}</ref><ref name="KristensenKorda2021">{{cite journal |last1=Kristensen |first1=Hans M. |last2=Korda |first2=Matt |title=Russian nuclear weapons, 2021 |journal=Bulletin of the Atomic Scientists |volume=77 |issue=2 |year=2021 |pages=90–108 |issn=0096-3402 |doi=10.1080/00963402.2021.1885869 |bibcode=2021BuAtS..77b..90K |quote=All Delta IVs are part of the Northern Fleet and based at Yagelnaya Bay ([[Gadzhiyevo]]) on the Kola Peninsula.|doi-access=free}}</ref>
{{-}}
{| class="wikitable"
|+Delta IV class — Ships of the class
! style= width:3em; | #
!Shipyard
!Name
!Laid down
!Launched
!Com-missioned
!Fleet
!Status
|-
|''[[Russian submarine K-51 Verkhoturye|K-51]]''
|SEVMASH, Severodvinsk
|''Verkhoturye''
|23 Feb 1981
|7 Mar 1984
|28 Dec 1984
|Northern
| Active, overhaul 2010–12, overhaul completed,{{citation needed|date=January 2023}}<!-- a 2010 source cannot support that an overhaul was completed in 2012; nor that the boat is active in 2023 --> upgraded Sineva missiles installed<ref name="thebulletin2010">{{cite journal |title=Russian Nuclear Forces, 2010 |last1=Norris |first1=Robert S. |last2=Kristensen |first2=Hans M. |journal=Bulletin of the Atomic Scientists |date=Jan 2010 |volume=66 |number=1 |pages=74–81 |doi=10.2968/066001010 |bibcode=2010BuAtS..66a..74N |s2cid=145187667 |doi-access=free }}</ref>
|-
|''[[Russian submarine K-84 Ekaterinburg|K-84]]''
|SEVMASH, Severodvinsk
|''Ekaterinburg''
|17 Feb 1982
|17 Mar 1985
|30 Dec 1985
|Northern
|Inactive. Upgraded Sineva missiles installed,<ref name="thebulletin2010"/> overhaul 2011–14 (29 Dec 2011 a fire broke out while ship was drydocked and the vessel was partially submerged to control the flames.<ref name="Reuters">{{cite web |url=https://www.reuters.com/article/us-russia-submarine-fire-idUSTRE7BS0MJ20111229 |title=Russia battles fire on nuclear submarine |date=2011-12-29 |work=Reuters |access-date=2011-12-29 |archive-url=https://web.archive.org/web/20111229204550/http://www.reuters.com/article/2011/12/29/us-russia-submarine-fire-idUSTRE7BS0MJ20111229 |archive-date=2011-12-29 |url-status=live}}</ref>) Re-commissioned in Dec 2014.<ref>{{cite journal |url=http://russianforces.org/blog/2014/12/ekaterinburg_and_vladimir_mono.shtml |title=Ekaterinburg and Vladimir Monomakh join the fleet |journal=Russian Strategic Nuclear Forces |date=2014-12-19 |access-date=2014-12-23 |archive-url=https://web.archive.org/web/20141219185548/http://russianforces.org/blog/2014/12/ekaterinburg_and_vladimir_mono.shtml |archive-date=2014-12-19 |url-status=live|last1=Podvig |first1=Pavel }}</ref> Removed from active service and prepared for decommissioning in 2020<ref>{{Cite web |url=https://www.oblgazeta.ru/society/defense/116245/ |title=Игорь Британов: командир, ушедший с гибнущей К-219 последним |trans-title=Igor Britanov: the commander who left the dying K-219 last |language=ru |first=Рудольф |last=Грашин |website=Oblgazeta.ru}}</ref>
|-
|''[[Russian submarine BS-64 Podmoskovye|BS-64]]'' (ex ''K-64'')
|SEVMASH, Severodvinsk
|''Podmoskovye''
|18 Dec 1982
|2 Feb 1986
|23 Dec 1986
|Northern
|Active,{{citation needed|date=January 2023}}<!-- a 2012 and 2017 source cannot support that the boat is active in 2023 --> in 1999–2016 was in conversion to a Project 09787 special purpose platform.<ref>{{Cite web |url=http://www.deepstorm.ru/DeepStorm.files/45-92/nbrs/667BDRM/K-64/K-64.htm |script-title=ru:й-64, ая-64 оПНЕЙР 667адпл |website=DeepStorm |access-date=2010-10-19 |language=ru |archive-url=https://web.archive.org/web/20120210043021/http://www.deepstorm.ru/DeepStorm.files/45-92/nbrs/667BDRM/K-64/K-64.htm |archive-date=2012-02-10 |url-status=live}}</ref><ref>{{Cite web |url=http://navyrecognition.com/index.php/news/defence-news/2016/december-2016-navy-naval-forces-defense-industry-technology-maritime-security-global-news/4732-project-09787-special-purpose-submarine-bs-64-podmoskovye-handed-over-to-russian-navy.html |title=Project 09787 Special-Purpose Submarine BS-64 "Podmoskovye" Handed Over to Russian Navy |date=Dec 2016 |website=Navy Recognition |access-date=2017-01-02 |archive-url=https://web.archive.org/web/20170103003939/http://navyrecognition.com/index.php/news/defence-news/2016/december-2016-navy-naval-forces-defense-industry-technology-maritime-security-global-news/4732-project-09787-special-purpose-submarine-bs-64-podmoskovye-handed-over-to-russian-navy.html |archive-date=2017-01-03 |url-status=live}}</ref> Cut out all the missile silos.<ref>{{cite web |url=http://www.deepstorm.ru/DeepStorm.files/45-92/nbrs/667BDRM/K-64/K-64.htm |title=й-64, ая-64 оПНЕЙР 667адпл |website=DeepStorm |language=ru |access-date=2014-02-02 |archive-url=https://web.archive.org/web/20120210043021/http://www.deepstorm.ru/DeepStorm.files/45-92/nbrs/667BDRM/K-64/K-64.htm |archive-date=2012-02-10 |url-status=live}}</ref>
|-
|''[[Russian submarine K-114 Tula|K-114]]''
|SEVMASH, Severodvinsk
|''Tula''
|22 Feb 1984
|22 Jan 1987
|30 Oct 1987
|Northern
|In overhaul 2014–2017, returned to active duty in Dec 2017,<ref>{{Cite web |url=http://navaltoday.com/2017/02/27/russian-delta-class-ssbn-tula-leaves-hangar-during-refit/ |title=Russian Delta-class SSBN 'Tula' leaves hangar during refit |date=Feb 27, 2017 |website=Naval Today |access-date=2017-03-05 |archive-url=https://web.archive.org/web/20170306035533/http://navaltoday.com/2017/02/27/russian-delta-class-ssbn-tula-leaves-hangar-during-refit/ |archive-date=2017-03-06 |url-status=live}}</ref><ref>{{Cite web |url=https://zvezdochka-ru.livejournal.com/397845.html |title="Звёздочка" завершила ремонт АПЛ "Тула" |trans-title=Zvezdochka completes repair of the nuclear submarine "Tula" |language=ru |date=2017-12-28 |website=Zvezdochka.ru}}</ref> upgraded Sineva missiles installed<ref name="thebulletin2010"/>
|-
|''[[Russian submarine K-117 Bryansk|K-117]]''
|SEVMASH, Severodvinsk
|''Bryansk''
|20 Apr 1985
|8 Feb 1988
|30 Sep 1988
|Northern
|Active,{{citation needed|date=January 2023}}<!-- a 2018 source cannot support that the boat is active in 2023 --> overhaul 2002–08, overhaul complete, upgraded Sineva missiles installed.<ref name="thebulletin2010"/>  Technical conditioning to extend service life by 3.5 years scheduled to commence post Mar 2018.<ref>{{Cite web |url=https://flotprom.ru/2017/Звездочка15/ |title="Звездочка" способна продлить срок службы АПЛ "Брянск" на 5 лет |trans-title=Zvezdochka can extend the service life of the nuclear submarine "Bryansk" by 5 years |website=FlotProm |language=ru |access-date=2018-01-03 |archive-url=https://web.archive.org/web/20180104014634/http://flotprom.ru/2017/%D0%97%D0%B2%D0%B5%D0%B7%D0%B4%D0%BE%D1%87%D0%BA%D0%B015/ |archive-date=2018-01-04 |url-status=live}}</ref>
|-
|''[[Russian submarine K-18 Karelia|K-18]]''
|SEVMASH, Severodvinsk
|''Karelia''
|7 Feb 1986
|2 Feb 1989
|10 Oct 1989
|Northern
|Active, overhaul 2004–10, overhaul complete,<ref>{{Cite journal |url=http://russianforces.org/blog/2010/01/karelia_submarine_returns_to_s.shtml |title=Karelia submarine returns to service |date=22 Jan 2010 |journal=Russian Strategic Nuclear Forces |access-date=19 Oct 2010 |archive-url=https://web.archive.org/web/20110606223621/http://russianforces.org/blog/2010/01/karelia_submarine_returns_to_s.shtml |archive-date=6 Jun 2011 |url-status=live|last1=Podvig |first1=Pavel }}</ref> upgraded Sineva missiles installed<ref name="thebulletin2010"/>
|-
|''[[Russian submarine K-407 Novomoskovsk|K-407]]''
|SEVMASH, Severodvinsk
|''Novomoskovsk''
|2 Feb 1987
|28 Feb 1990
|27 Nov 1990
|Northern
|Active,{{citation needed|date=January 2023}}<!-- 2011 sources does not that the boat is active in 2023 --> overhaul 2008–2012, overhaul complete,<ref>{{cite web |url=http://flot.com/news/vpk/index.php?ELEMENT_ID=58265 |language=ru |title=Продолжаются ремонт и модернизация РПКСН "Новомосковск" |trans-title=The repair and modernization of the SSBN "Novomoskovsk" |website=Flot |date=2010-11-19 |access-date=2011-08-07 |archive-url=https://web.archive.org/web/20110723061816/http://flot.com/news/vpk/index.php?ELEMENT_ID=58265 |archive-date=2011-07-23 |url-status=live}}</ref><ref>{{cite web |url=http://rusnavy.com/news/navy/index.php?ELEMENT_ID=10837 |title=Repair and upgrade of SSBN Novomoskovsk is in progress |website=RusNavy |date=2010-11-19 |access-date=2011-08-07 |archive-url=https://web.archive.org/web/20111018045028/http://rusnavy.com/news/navy/index.php?ELEMENT_ID=10837 |archive-date=2011-10-18 |url-status=live}}</ref> upgraded Sineva missiles installed<ref name="thebulletin2010"/>
|}

== In popular culture ==
The submarine in the [[Doctor Who]] episode ''[[Cold War (Doctor Who)|Cold War]]'' that [[Clara Oswald]] and the eleventh Doctor were stranded on is likely a Delta-Class submarine. <ref>{{Cite AV media |url=https://www.bbc.co.uk/iplayer/episode/b01s1cz7/doctor-who-20052022-series-7-9-cold-war |title=Doctor Who (2005–2022) - Series 7: 9. Cold War |language=en-GB |access-date=2024-08-29 |via=www.bbc.co.uk}}</ref>

==See also==
* [[List of Soviet and Russian submarine classes]]
* [[Future of the Russian Navy]]
* [[Submarine-launched ballistic missile]]

==Citations==
{{Reflist}}

==References==
*{{cite book |first=Robert |last=Jackson |date=2006 |title=The Encyclopedia Of Warships, From World War 2 To The Present Day |location=San Diego |publisher=[[Thunder Bay Press]] |isbn=978-1-59223-627-5}}

==External links==
{{Commons category|Delta class submarines}}
{{colbegin}}
*[https://www.globalsecurity.org/wmd/world/russia/667b.htm 667B Murena/Delta I] at [[GlobalSecurity.org]]
*[https://www.globalsecurity.org/wmd/world/russia/667bdr.htm 667BDR Delta III] at GlobalSecurity.org
*[https://web.archive.org/web/20020202124156/http://www.aeronautics.ru/archive/fleet/russian/667.htm Type 667 "Delta" class] at Aeronautics.ru
*[http://www.naval-technology.com/projects/delta SSBN Delta Class IV (Project 667.BDRM)] at Naval-technology.com
*[https://web.archive.org/web/20061013190908/http://www.armscontrol.ru/atmtc/Arms_systems/Navy/Submarine/Kalmar_Proj667_StratSub.htm Project 667.BDR Kalmar Strategic Missile Undersea Cruiser (Delta-3 class, 14 subs)] at Armscontrol.ru
*[http://www.fas.org Federation of American Scientists]
*[http://www.hazegray.org/worldnav/russia/ Haze Gray & Underway: World Navies Today: Russia]
{{colend}}
{{Delta-class submarine}}
{{Soviet and Russian submarines after 1945}}
{{SSBN classes in service}}
{{Use dmy dates|date=September 2019}}

[[Category:Submarine classes]]
[[Category:Delta-class submarines| ]]
[[Category:Cold War submarines of the Soviet Union| ]]
[[Category:Submarines of Russia| ]]
[[Category:Submarine classes of the Russian and Soviet Navy]]
[[Category:Soviet inventions]]
[[Category:Nuclear-powered submarines]]