{"id":4013,"date":"2026-01-02T00:14:59","date_gmt":"2026-01-01T18:44:59","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=4013"},"modified":"2026-01-03T16:19:00","modified_gmt":"2026-01-03T10:49:00","slug":"submarines-in-india","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/submarines-in-india\/","title":{"rendered":"Indian Submarines, Types, Significance, Issues, List, UPSC Notes"},"content":{"rendered":"

Submarines are\u00a0specialised watercrafts<\/strong>\u00a0capable of independent\u00a0underwater operations<\/strong>\u00a0using onboard power and systems for extended periods. They play a vital role in naval warfare due to their\u00a0stealth\u00a0<\/strong>and\u00a0agility<\/strong>. As a key part of maritime defence, they can conduct intelligence gathering and anti-submarine operations. Modern submarines have advanced navigation, communication, and weapons systems, making them formidable naval assets.<\/p>\r\n

India has significant submarine platforms supporting its maritime interests, encompassing different classes of\u00a0diesel-electric attack submarines<\/strong>\u00a0as well as\u00a0nuclear-powered submarines\u00a0<\/strong>with the ability to launch ballistic missiles. Alongside these existing vessels, India is developing next-generation submarines, ships and destroyers to continue strengthening its naval capabilities.<\/p>\r\n

Submarine Technology<\/h2>\r\n

Submarines are notable for their strategic importance and are equipped with a wide range of advanced technologies.<\/p>\r\n

\"Indian<\/figure>\r\n

Propulsion<\/h3>\r\n

Submarines use a variety of propulsion systems, such as\u00a0battery-electric propulsion<\/strong>,\u00a0diesel-electric engines, Air-independent propulsion, and nuclear reactors.<\/strong><\/p>\r\n

    \r\n\t
  • Air-independent propulsion: It provides extra underwater endurance to the non-nuclear submarines (SSKs) so that they can stay underwater for a longer time (two weeks).<\/strong>\r\n
      \r\n\t
    • Without this, they have to come to the surface every 48 hours.<\/strong><\/li>\r\n\t
    • AIP makes the non-nuclear submarines virtually silent and even more stealthier than the nuclear submarines. The reactors of nuclear submarines make some amount of detectable noise, making them vulnerable.<\/li>\r\n\t
    • Three types of AIP technology are used -\u00a0Steam engine<\/strong>\u00a0(ethanol and oxygen),\u00a0Stirling engine<\/strong>\u00a0(liquid oxygen and diesel fuel) and fuel cells (Hydrogen cell, lithium-ion battery, etc.).<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

      Armaments<\/h3>\r\n

      Submarines carry both offensive and defensive weapons.<\/p>\r\n

        \r\n\t
      • Offensive weapons<\/strong>: These can be\u00a0nuclear as well as conventional,\u00a0<\/strong>depending on the objectives.\r\n\r\n
          \r\n\t
        • Submarines are equipped with\u00a0torpedoes, cruise missiles, or ballistic missiles.<\/strong><\/li>\r\n\t
        • Submarine-launched ballistic missiles<\/strong>\u00a0with nuclear warheads are the most important armament on submarines, which makes them strategic rather than merely offensive.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

          Navigation<\/h3>\r\n

          Submarines navigate through the ocean virtually blind due to limited light penetration. They use\u00a0GPS\u00a0<\/strong>for surface navigation, and inertial guidance systems for underwater navigation.<\/p>\r\n

            \r\n\t
          • \u00a0Inertial guidance systems:\u00a0<\/strong>Underwater, they use\u00a0inertial guidance systems (<\/strong>electric and mechanical) using\u00a0gyroscopes.<\/strong>\r\n
              \r\n\t
            • These systems are accurate for 150 hours and must be realigned with other surface-dependent navigational systems like\u00a0GPS, radio, radar,\u00a0<\/strong>and\u00a0satellite<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
            • SONAR:\u00a0<\/strong>Submarines use SONAR technology, which emits and analyses sound waves, to detect and track other vessels.\r\n\r\n
                \r\n\t
              • Both\u00a0active\u00a0<\/strong>(sound generated by submarines and then reflected by the target) and\u00a0passive\u00a0<\/strong>(sound generated by the target) sonars are used.<\/li>\r\n\t
              • They aid submarines in detecting obstacles to the Earth\u2019s magnetic field as well as deterring any underwater threat to the submarines.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

                Communication<\/h3>\r\n

                Submarines use radio communication systems at\u00a0Very Low Frequency (VLF)\u00a0<\/strong>and\u00a0Extremely Low Frequency (ELF)\u00a0<\/strong>to transmit and receive messages.<\/p>\r\n

                  \r\n\t
                • They can establish\u00a0long-range, secure,\u00a0<\/strong>and\u00a0high-bandwidth<\/strong>\u00a0communication links with satellites.<\/li>\r\n\t
                • Communication buoys\u00a0<\/strong>can be deployed at the surface for communication without the need to surface.<\/li>\r\n\t
                • Underwater telephone systems\u00a0<\/strong>allow voice communication and are used for tactical or operational coordination. These systems are designed to protect confidentiality and integrity.<\/li>\r\n\t
                • Submarine communication systems\u00a0<\/strong>are typically integrated with the broader command and control infrastructure for seamless information exchange.<\/li>\r\n<\/ul>\r\n
                  \"Submarine<\/figure>\r\n

                  Types of Submarines<\/h2>\r\n

                  Based on propulsion technology, submarines can be categorised into\u00a0two types<\/strong>\u00a0- Diesel-powered conventional attack submarines (SSKs) and Nuclear-powered submarines (SSNs and SSBNs).<\/p>\r\n

                  \r\n\r\n\r\n\r\n\r\n\r\n\r\n
                  Submarine Type<\/strong><\/td>\r\nKey Features<\/strong><\/td>\r\n<\/tr>\r\n
                  SSK<\/strong><\/td>\r\n\r\n

                  - SSK stands for\u00a0\"Diesel-Electric Attack Submarine\"<\/strong><\/p>\r\n

                    \r\n\t
                  • The\u00a0SS<\/strong>\u00a0indicated that the vessel was a\u00a0submarine<\/strong>, while the\u00a0K<\/strong>\u00a0suffix signified that it was a\u00a0hunter-killer.<\/strong><\/li>\r\n<\/ul>\r\n

                    -\u00a0Features:<\/strong><\/p>\r\n

                      \r\n\t
                    • SSK submarines are typically\u00a0smaller in size<\/strong>.<\/li>\r\n\t
                    • They rely on diesel engines for surface propulsion and electric batteries for submerged operations.<\/li>\r\n\t
                    • SSK submarines without AIP use diesel fuel for surface propulsion and rechargeable batteries for underwater operations.<\/li>\r\n\t
                    • They are stealthier than nuclear submarines, and the inclusion of AIP makes them more stealthier.<\/li>\r\n<\/ul>\r\n

                      - Applications:<\/strong>\u00a0They are used for coastal defence, anti-submarine warfare, intelligence gathering, and reconnaissance.<\/p>\r\n

                      - Examples (without AIP): Gotland-class submarine<\/strong>\u00a0used by the Swedish Navy.<\/p>\r\n

                      - Examples (with AIP): The Kilo-class submarine<\/strong>\u00a0is used by various navies around the world.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

                  SSN<\/strong><\/td>\r\n\r\n

                  - SSN stands for \u201cSubmersible Ship Nuclear\u201d\u00a0<\/strong>and is a nuclear-powered Attack Submarine.<\/p>\r\n

                  - Features:<\/strong><\/p>\r\n

                    \r\n\t
                  • SSN submarines are larger and faster than SSK submarines.<\/li>\r\n\t
                  • They are powered by nuclear reactors, which provide them with virtually unlimited range and endurance, limited only by food support.<\/li>\r\n<\/ul>\r\n

                    - Applications:<\/strong>\u00a0They are primarily used for offensive operations, such as anti-ship and anti-submarine warfare, intelligence gathering, and surveillance.<\/p>\r\n

                    - Example:<\/strong>\u00a0The United States Navy operates several classes of SSN submarines, including the Virginia-class submarines.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

                  SSBN<\/strong><\/td>\r\n\r\n

                  - SSBN stands for\u00a0Sub-Surface Ballistic Nuclear\u00a0<\/strong>as they are capable of launching ballistic missiles.<\/p>\r\n

                  - Features:<\/strong>\u00a0SSBN submarines are designed to carry and launch SLBMs.<\/p>\r\n

                    \r\n\t
                  • They are larger and have more advanced missile systems compared to other types of submarines.<\/li>\r\n\t
                  • Like SSN, they use nuclear reactors to propulsion and generate power for the missile systems.<\/li>\r\n<\/ul>\r\n

                    - Applications:<\/strong>\u00a0SSBN submarines mainly serve for strategic nuclear deterrence for a country.<\/p>\r\n

                    - Example:\u00a0<\/strong>The United States Navy operates the\u00a0Ohio-class\u00a0<\/strong>SSBN submarines.<\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n

                    Submarines in India<\/h2>\r\n

                    India deploys a spectrum of conventional and nuclear-powered submarines equipped with suitable sensor suites, armaments and engines fulfilling niche maritime operations.<\/p>\r\n

                    India has three classes of submarines - the Shishumar class, the Sindhughosh class, and the indigenously developed Kalvari class.<\/p>\r\n

                      \r\n\t
                    • Shishumar class<\/strong>: These\u00a04 submarines<\/strong>\u00a0were commissioned under technology transfer from\u00a0Germany.<\/strong>\r\n
                        \r\n\t
                      • They carry advanced sensory capabilities optimised for\u00a0anti-sub\u00a0<\/strong>and\u00a0anti-ship<\/strong>\u00a0warfare to dominate the Arabian Sea.<\/li>\r\n\t
                      • The commissioned Sishumar class submarines are\u00a0INS Shishumar, INS Shankush, INS Shalki and INS Shankul.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                      • Sindhughosh class<\/strong>\u00a0- It includes\u00a07 active<\/strong>\u00a0Russian-origin\u00a0Kilo-class<\/strong>\u00a0submarines.\r\n\r\n
                          \r\n\t
                        • A total of 10 submarines were commissioned, 3 of them have been decommissioned.<\/li>\r\n\t
                        • They contain satellite sensors, radar, sonar and electronic surveillance as well as anti-ship and anti-submarine weaponry.<\/li>\r\n\t
                        • The commissioned Sindhughosh class submarines are\u00a0INS Sindhughosh, INS Sindhudhvaj, INS Sindhuraj, INS Sindhuvir, INS Sindhuratna and INS Sindhukesari.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                        • Kalvari class<\/strong>\u00a0- These are the indigenously built six diesel-electric submarines of\u00a0Contemporary Barracuda<\/strong>\u00a0designs under technology transfer from France\u2019s\u00a0Scorpene class\u00a0<\/strong>submarines, built at Mazagon Dock.\r\n\r\n
                            \r\n\t
                          • Names of the Kalvari class submarines (commissioned only) are\u00a0INS Kalvari, INS Khanderi, INS Karanj, INS Vela and INS Vagir.<\/strong><\/li>\r\n\t
                          • These submarines have been built under the name of Project 75.<\/li>\r\n\t
                          • The sixth and final submarine under Project 75, INS Vagsheer, will be delivered to the Indian Navy in 2024.<\/li>\r\n\t
                          • Further, these submarines are to be loaded with the Air Independent Propulsion under Project 75 (I). All the submarines under Project 75I are under development.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

                            Nuclear-Powered Attack Submarines (SSN)<\/h3>\r\n

                            India presently does not have any nuclear-powered attack submarines (SSNs) in service. The\u00a0Akula class submarine INS Chakra II,<\/strong>\u00a0leased from Russia, has been decommissioned in 2021.<\/p>\r\n

                              \r\n\t
                            • However, India has reinforced its SSN lineup by ordering another\u00a0Akula class submarine (INS Chakra III),<\/strong>\u00a0planned for induction in 2025.<\/li>\r\n\t
                            • Moreover, there are plans for indigenous\u00a0Project 75 Alpha SSNs<\/strong>\u00a0in the future.<\/li>\r\n<\/ul>\r\n

                              Nuclear ballistic missile submarines (SSBN)<\/h3>\r\n

                              India presently has one SSBN -\u00a0INS Arihant,\u00a0<\/strong>an Arihant Class SSBNwhich has been developed indigenously under the Advanced Technology Vessel program.<\/p>\r\n

                                \r\n\t
                              • INS Arihant (S2):\u00a0<\/strong>Launched in 2009 and commissioned in 2016, it features a double-hull with advanced sensors, periscopes, and weapon systems, including strategic SLBMs.\r\n\r\n
                                  \r\n\t
                                • It can carry either 12\u00a0K-15<\/strong>\u00a0(Sagarika) missiles with 750 Kms range or 4\u00a0K-4<\/strong>\u00a0missiles with 3500 Kms range.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                                • INS Arighat (S3):<\/strong>\u00a0It is India\u2019s second SSBN,\u00a0being built<\/strong>\u00a0as an upgraded version of INS Arihant.<\/li>\r\n\t
                                • Further, S4 and S5 SSBNs are in the planning phase.<\/li>\r\n<\/ul>\r\n

                                  Submarines in India Significance<\/h2>\r\n

                                  A modern and highly capable submarine fleet holds great significance for advancing the naval strategy and maritime interests of any country including India.<\/p>\r\n

                                    \r\n\t
                                  • Completes India\u2019s Nuclear Triad: INS Arihant<\/strong>\u00a0is capable of launching submarine-launched ballistic missiles (SLBMs) providing assured second-strike capability.\r\n\r\n
                                      \r\n\t
                                    • This enables India to retaliate massively even after a hypothetical first nuclear strike has destroyed land-based missiles and air bases.<\/li>\r\n\t
                                    • This reinforces India\u2019s nuclear deterrence stability and provides a\u00a0balance of power<\/strong>\u00a0in the Indo-Pacific region.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                                    • Makes India a naval power in the Indian Ocean:<\/strong>\u00a0The offensive capability of India's growing submarine fleet acts as a powerful deterrent against adversarial actions both on land and sea-based borders.\r\n\r\n
                                        \r\n\t
                                      • They contribute to greater maritime stability by acting as a deterrent to aggressive posturing.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                                      • Access denial<\/strong>: It involves blocking enemy naval formations using mines, torpedoes, and anti-ship missiles, while diesel submarines are designed to impede maritime movement during conflicts.<\/li>\r\n\t
                                      • Sea control<\/strong>: It provides control of parts of the sea and contests dominance through surprise missile attacks.\r\n\r\n
                                          \r\n\t
                                        • It secures the Sea lines of Communication around India.<\/li>\r\n\t
                                        • India requires expanded underwater capability to secure expanding strategic maritime spaces in the Indo-Pacific.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                                        • Intelligence, Surveillance and Reconnaissance (ISR)<\/strong>: Submarines gather critical maritime intelligence through sustained underwater surveillance of global hotspots and chokepoints using\u00a0Electronic Support Measures(ESM)<\/strong>\u00a0and\u00a0Electronic Counter Measures (ECM)\u00a0<\/strong>suites.<\/li>\r\n<\/ul>\r\n

                                          Issues with the Submarine Capability of India<\/h2>\r\n

                                          While India has made remarkable progress in submarine technologies, several challenges remain for smooth induction as well as operations:<\/p>\r\n

                                            \r\n\t
                                          • Lack of strength:\u00a0<\/strong>India lacks the total number of submarines, needed for its presence in the large Indian Ocean and two adversaries across the border. Currently, India only has 16 SSKs, 1 SSBN and 0 SSN.\r\n\r\n
                                              \r\n\t
                                            • Even with SSKs, India only has 6 AIP-SSKs (the last one is to be commissioned soon).<\/li>\r\n\t
                                            • The INS Arihant is armed with 12 indigenously developed K-15 SLBMs, with a range of just 750 km. These SLBMs are ineffective against China.<\/li>\r\n\t
                                            • The K-4 missiles, with a 3500 km range, have been trialled but are yet to be commissioned in service.<\/li>\r\n\t
                                            • This implies the\u00a0asymmetry of naval power<\/strong>\u00a0vis-a-vis China.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                                            • Modernisation constraints<\/strong>:\r\n\r\n
                                                \r\n\t
                                              • Budgetary limitations and project delays have impacted submarine force levels and technological currency.<\/li>\r\n\t
                                              • The challenges lie in maintaining indigenous submarine development while keeping pace with rapid technological advancements in undersea warfare and stealth technologies.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

                                                India's submarines must adapt to changing undersea dynamics, including advanced anti-submarine warfare capabilities and evolving threats<\/p>","protected":false},"excerpt":{"rendered":"

                                                Overview of submarines in Indian Navy: Diesel-electric & nuclear-powered boats, with indigenous AIP, Scorpene class, & Arihant class.<\/p>\n","protected":false},"author":6,"featured_media":7986,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[173],"tags":[538,40],"class_list":{"0":"post-4013","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-quest-level-3","8":"tag-indian-submarines","9":"tag-quest"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4013","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=4013"}],"version-history":[{"count":1,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4013\/revisions"}],"predecessor-version":[{"id":19893,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4013\/revisions\/19893"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/7986"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=4013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=4013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=4013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}