Editing Oscar-class submarine (section)

=== Belgorod, Project 09852 ===
 {{Main|Russian submarine Belgorod}}
In December 2012, construction began on a special purpose research and rescue submarine, designated Project 09852, and based on the incomplete Project 949A (Oscar II class) submarine [[Russian submarine Belgorod (K-329)|''Belgorod'']].<ref>{{cite web|url=http://www.deagel.com/Nuclear-Attack-Submarines/Project-09852_a000343002.aspx|title=Project 09852|website=Deagel.com|access-date=2016-12-26|archive-url=https://web.archive.org/web/20161228135041/http://www.deagel.com/Nuclear-Attack-Submarines/Project-09852_a000343002.aspx|archive-date=2016-12-28|url-status=live}}</ref><ref name="world-nuclear-news1">{{cite web |url=http://www.world-nuclear-news.org/NN-Russia_builds_deep_sea_research_submarine-2112126.html |title=Russia builds deep-sea research submarine |publisher=World-nuclear-news.org |date=2012-12-21 |access-date=2013-02-06 |archive-url=https://web.archive.org/web/20130213062020/http://www.world-nuclear-news.org/NN-Russia_builds_deep_sea_research_submarine-2112126.html |archive-date=2013-02-13 |url-status=live }}</ref><ref>{{cite web |url=http://barentsobserver.com/en/security/2012/12/russia-builds-nuclear-submarine-deep-water-research-21-12 |title=Russia builds nuclear submarine for deep-water research |work=Barents Observer |access-date=29 April 2013 |archive-url=https://web.archive.org/web/20130403234034/http://barentsobserver.com/en/security/2012/12/russia-builds-nuclear-submarine-deep-water-research-21-12 |archive-date=3 April 2013 |url-status=live |df=dmy-all }}</ref> The submarine is reportedly designed to carry both manned (e.g. Project 18511 midget submarine) as well as unmanned (e.g. Klavesin-1R) underwater vessels.<ref name="world-nuclear-news1"/><ref name="hisutton.com">{{cite web|url=http://www.hisutton.com/Spy%20Subs%20-Project%2009852%20Belgorod.html|title=Spy Subs -Project 09852 Belgorod|website=Hisutton.com|access-date=23 April 2019|archive-url=https://web.archive.org/web/20190423195513/http://www.hisutton.com/Spy%2520Subs%2520-Project%252009852%2520Belgorod.html|archive-date=23 April 2019|url-status=live|df=dmy-all}}</ref> However, while carrying smaller unmanned underwater vehicles (UUVs) would be possible as-is on an Oscar-class hull, the accommodation of a midget submarine such as Project 18511 ''Paltus'' or the even larger [[Russian submarine Losharik|Project 10831 ''Losharik'']],<ref>{{cite web |author=John Pike |url=http://www.globalsecurity.org/military/world/russia/210.htm |title=Project 210 Losharik |publisher=Globalsecurity.org |access-date=2013-02-06 |archive-url=https://web.archive.org/web/20121226065523/http://www.globalsecurity.org/military/world/russia/210.htm |archive-date=2012-12-26 |url-status=live }}</ref> would probably require a major hull extension in order to accommodate a docking compartment. For example, the length of the submarine BS-64 ''Podmoskovye'' was increased by {{convert|9|m}} even though the SLBM missile compartment was completely removed.<ref>{{cite web |url=http://www.janes.com/article/64929/russia-s-new-submarine-mothership-sets-sail |title=Russia's new submarine mothership sets sail &#124; IHS Jane's 360 |access-date=2016-12-26 |archive-url=https://web.archive.org/web/20170212161303/http://www.janes.com/article/64929/russia-s-new-submarine-mothership-sets-sail |archive-date=2017-02-12 |url-status=dead }}</ref><ref>{{cite web|url=http://barentsobserver.com/en/security/2015/08/russian-nuclear-submarine-launched-after-modernization-13-08|title=Barentsobserver|website=Barentsobserver|access-date=2016-12-26|archive-url=https://web.archive.org/web/20150822150825/http://barentsobserver.com/en/security/2015/08/russian-nuclear-submarine-launched-after-modernization-13-08|archive-date=2015-08-22|url-status=live}}</ref>

''Belgorod'' will be reportedly used as a carrier of the rumored [[Status-6 Oceanic Multipurpose System|Poseidon]] ([[NATO reporting name]] '''Kanyon''') nuclear-powered, thermonuclear armed [[Autonomous underwater vehicle|unmanned underwater device]] capable to carry a 100 Mt [[thermonuclear warhead]], with at least four such devices being carried horizontally in place of the 24 P-700 Granit (SS-N-19 ''Shipwreck'') launchers for a total yield of 600 [[TNT equivalent|megatonnes of TNT]].<ref name="hisutton.com"/><ref>{{cite web|url=http://www.hisutton.com/Analysis%20-%20Russian%20Status-6%20aka%20KANYON%20nuclear%20deterrence%20and%20Pr%2009851%20submarine.html|title=Analysis - Russian Status-6 aka KANYON nuclear deterrence and Pr 09851 submarine|website=hisutton.com|access-date=23 April 2019|archive-url=https://web.archive.org/web/20190217102317/http://www.hisutton.com/Analysis%20-%20Russian%20Status-6%20aka%20KANYON%20nuclear%20deterrence%20and%20Pr%2009851%20submarine.html|archive-date=17 February 2019|url-status=live|df=dmy-all}}</ref><ref>{{cite web|url=https://www.defensenews.com/space/2018/01/12/russias-nuclear-underwater-drone-is-real-and-in-the-nuclear-posture-review/|title=Russia's nuclear underwater drone is real and in the Nuclear Posture Review|website=defensenews.com|date=12 January 2019|access-date=23 April 2019|archive-date=25 February 2023|archive-url=https://web.archive.org/web/20230225165233/https://www.defensenews.com/space/2018/01/12/russias-nuclear-underwater-drone-is-real-and-in-the-nuclear-posture-review/|url-status=live}}</ref><ref>{{cite web|url=https://www.popularmechanics.com/military/weapons/a25953089/russia-apocalypse-torpedo-poseidon/|title=The Truth Behind Russia's 'Apocalypse Torpedo'|website=popularmechanics.com|date=18 January 2019|access-date=23 April 2019|archive-url=https://web.archive.org/web/20190330225429/https://www.popularmechanics.com/military/weapons/a25953089/russia-apocalypse-torpedo-poseidon/|archive-date=30 March 2019|url-status=live|df=dmy-all}}</ref>

It is estimated that ''Belgorod'' will be {{convert|184|m}} long which would make it the longest submarine in the world.<ref name="hisutton.com"/><ref>{{cite web|url=https://thebarentsobserver.com/en/security/2017/05/russias-new-military-research-submarine-arctic-waters-will-be-worlds-largest|title=Now, Russia builds a submarine even bigger than the Typhoon|website=thebarentsobserver.com|date=3 May 2017|access-date=23 April 2019|archive-url=https://web.archive.org/web/20180929024151/https://thebarentsobserver.com/en/security/2017/05/russias-new-military-research-submarine-arctic-waters-will-be-worlds-largest|archive-date=29 September 2018|url-status=live|df=dmy-all}}</ref>

On 23 April 2019, ''Belgorod'' was floated out of a slipway during a ceremony at the Sevmash shipyard, watched by the President of Russia [[Vladimir Putin]] via a TV-link. Further work was to be completed afloat and the submarine was scheduled to start its factory and state trials in 2020 after which it was to be delivered to the Russian Navy.<ref name="Belgorod floated out">{{cite web|url=http://tass.com/defense/1055188|title=Russia floats out first nuclear sub that will carry Poseidon strategic underwater drones|website=[[TASS]]|date=23 April 2019|access-date=23 April 2019|archive-url=https://web.archive.org/web/20190423160916/http://tass.com/defense/1055188|archive-date=23 April 2019|url-status=live|df=dmy-all}}</ref><ref>{{Cite web|url=https://www.foxnews.com/tech/russia-launches-doomsday-supersub|title=Russia launches huge 'doomsday' supersub|last=Rogers|first=James|date=2019-04-24|website=Fox News|language=en-US|access-date=2019-04-24|archive-url=https://web.archive.org/web/20190424211709/https://www.foxnews.com/tech/russia-launches-doomsday-supersub|archive-date=2019-04-24|url-status=live}}</ref> However, this schedule was delayed with sea trials then projected to begin in May 2021.<ref name="ReferenceA">{{Cite web|url=https://tass.com/defense/1274461|title=Belgorod nuclear submarine carrier with Poseidon nuke drones to serve in Pacific|website=Tass.com|access-date=2021-04-06|archive-date=2021-04-06|archive-url=https://web.archive.org/web/20210406130735/https://tass.com/defense/1274461|url-status=live}}</ref> After some delays, sea trials were reported to have started on June 25, 2021.<ref name="ReferenceB">{{Cite web|url=https://tass.com/defense/1307509|title=Belgorod nuclear sub begins its first sea trials|website=Tass.com|access-date=2021-06-26|archive-date=2021-06-26|archive-url=https://web.archive.org/web/20210626114132/https://tass.com/defense/1307509|url-status=live}}</ref> The submarine was delivered to the Russian Navy on 8 July 2022.<ref name="TASS Belgorod">{{cite web|url=https://tass.com/defense/1477527|title=Shipbuilders deliver special-purpose sub with nuclear-powered drones to Russian Navy|website=tass.com|date=8 July 2022|access-date=8 July 2022|archive-date=13 July 2022|archive-url=https://web.archive.org/web/20220713202704/https://tass.com/defense/1477527|url-status=live}}</ref>