Master10
Defence Technology & Ballistics Module

Naval Platforms, Submarines & Aircraft Carriers

India's maritime defence capability relies on high-end surface combatants and underwater deterrence platforms to secure sea lines of communication and project power across the Indo-Pacific. Naval air wings operate from two STOBAR (Short Take-Off But Arrested Recovery) aircraft carriers: the refurbished INS Vikramaditya and the indigenously designed and constructed INS Vikrant, commissioned in September 2022 at Cochin Shipyard Limited. The underwater fleet comprises conventional diesel-electric attack submarines built under Project-75 (Kalvari-class Scorpene design) at Mazagon Dock Shipbuilders, equipped with anti-ship missiles and wire-guided torpedoes. Most critically, India's sea-based nuclear deterrence is operationalised through nuclear-powered ballistic missile submarines (SSBNs), led by INS Arihant and INS Arighat, armed with submarine-launched ballistic missiles (SLBMs) like the K-15 Sagarika and K-4.

Key Concepts & Examination Highlights

  • INS Vikrant, commissioned in September 2022, is India's first indigenously designed and built aircraft carrier.
  • INS Arihant is India's first indigenous nuclear-powered ballistic missile submarine (SSBN), commissioned in 2016.
  • Project-75 resulted in the construction of six Scorpene-class diesel-electric attack submarines at Mazagon Dock Shipbuilders Limited (MDL).
  • Submarine-launched ballistic missile (SLBM) K-15 Sagarika provides INS Arihant with an underwater nuclear deterrence strike range of 750 km.
  • The six Kalvari-class Scorpene submarines inducted under Project 75 are INS Kalvari, INS Khanderi, INS Karanj, INS Vela, INS Vagir, and INS Vagsheer.
  • Project 75I (Project 75 India) is a procurement initiative for six advanced conventional submarines equipped with indigenous Air-Independent Propulsion (AIP) systems for prolonged underwater endurance.
  • Air-Independent Propulsion (AIP) allows non-nuclear submarines to operate without surfacing or using a snorkel to access atmospheric oxygen, drastically reducing acoustic detectability.
  • INS Arighaat, the second indigenous SSBN of the Arihant class, was commissioned in August 2024, armed with K-15 (750 km range) and K-4 (3,500 km range) SLBMs.
  • Project 15B Visakhapatnam-class stealth guided-missile destroyers feature high indigenous content, BrahMos supersonic cruise missiles, and Barak-8 SAM systems.
  • Mazagon Dock Shipbuilders Limited (MDL) in Mumbai and Garden Reach Shipbuilders & Engineers (GRSE) in Kolkata are the primary public sector shipyards building India's major frontline combatants.
  • Nuclear-powered attack submarines (SSNs) use nuclear reactors for high sustained underwater speed and endurance without carrying nuclear ballistic missiles, distinct from SSBNs.
  • INS Vikramaditya was originally constructed as the Soviet aircraft-carrying cruiser Baku (later renamed Admiral Gorshkov) before undergoing extensive refit and modernization for the Indian Navy.
  • INS Vikrant is powered by four General Electric LM2500 gas turbines generating over 88 megawatts of power, delivering top speeds exceeding 28 knots.
  • The ski-jump ramp on STOBAR aircraft carriers curves upward at the bow (typically 14 degrees on INS Vikrant) to impart an upward velocity component to launching combat aircraft.
  • Submarine hulls are designed as high-yield steel pressure hulls (such as HY-80 and HY-100 steel) or Russian DMR-249A grade steel to withstand intense hydrostatic pressures at deep diving depths.
  • The Scorpene-class submarines constructed under Project 75 feature the SUBTICS integrated combat management system and can launch SM39 Exocet anti-ship missiles while submerged.
  • The indigenous Air-Independent Propulsion (AIP) module developed by DRDO's Naval Materials Research Laboratory (NMRL) is based on fuel cell technology, generating electricity from hydrogen and oxygen.
  • Fuel cell based AIP systems produce minimal acoustic vibration and chemical exhaust compared to Stirling engines or closed-cycle diesel systems, ensuring superior underwater stealth.
  • INS Chakra refers to the nuclear-powered attack submarines (SSNs) leased by India from Russia (first a Charlie-class SSN in 1988, followed by an Akula-II class SSN in 2012) to train naval crews.
  • Project 17A Nilgiri-class frigates are constructed using advanced modular shipbuilding techniques at MDL and GRSE, integrating EL/M-2248 MF-STAR radar and BrahMos supersonic cruise missiles.
  • The Talwar-class frigates (such as INS Teg, INS Tarkash, INS Trikand) are stealth guided-missile frigates built in Russia and Goa Shipyard Limited, equipped with Club-N or BrahMos missiles.
  • INS Jalashwa is an amphibious transport dock (Landing Platform Dock, LPD) acquired from the United States (formerly USS Trenton), capable of deploying landing craft and transport helicopters for amphibious assaults.
  • The Sandhayak-class Survey Vessels (Large), built by GRSE, are hydrographic survey ships equipped with multi-beam echo sounders to map sea floors and coastal navigational channels.
  • Anti-Submarine Warfare Shallow Water Craft (ASW-SWC) such as the Arnala class are being built by CSL and GRSE to replace aging Abhay-class corvettes for coastal subsurface patrolling.
  • Sonar (Sound Navigation and Ranging) systems on Indian naval platforms include hull-mounted sonars (HUMSA-NG) and Advanced Light Towed Array Sonars (ALTAS) developed indigenously by DRDO's NPOL Kochi.
  • INS Vikrant (IAC-1) was constructed using approximately 26,000 tonnes of specialized high-tensile indigenous DMR 249A and DMR 249B steel developed by DRDO and SAIL.
  • INS Vikrant features an overall length of 262 meters, a beam width of 62 meters, and a flight deck area spanning approximately two full football fields.
  • The aircraft carrier INS Vikramaditya measures 284 meters in length, displaces 45,000 tonnes, and can carry up to 36 aircraft including MiG-29K fighters and Kamov Ka-31 helicopters.
  • Catapult Assisted Take-Off But Arrested Recovery (CATOBAR) utilizes steam or electromagnetic catapults (EMALS) to launch heavy aircraft from flat carrier decks, planned for India's future IAC-2.
  • The Electromagnetic Aircraft Launch System (EMALS) uses linear induction motors to accelerate carrier-borne aircraft smoothly across the flight deck with precise velocity control.
  • INS Arihant's nuclear reactor is an 83 MWt pressurized light water reactor (PWR) using enriched uranium fuel, developed by BARC with Russian technical consultancy.
  • The S4 and S4* are larger follow-on SSBNs being constructed under the Advanced Technology Vessel (ATV) project at the Ship Building Centre (SBC) in Visakhapatnam, carrying eight K-4 SLBMs.
  • Project 75 Alpha is an approved Indian naval program to construct six indigenous 6,000-tonne nuclear-powered attack submarines (SSNs) equipped with conventional cruise missiles.
  • The Sonar Dome mounted at the bulbous bow of surface warships is made of advanced rubber and composites developed by DRDO to house active/passive sonar transducers with minimal acoustic distortion.
  • Anechoic tiles are rubber or synthetic polymer tiles containing thousands of tiny acoustic voids glued to submarine outer hulls to absorb enemy active sonar ping pulses and muffle internal machinery noise.
  • Degaussing is a process where electrical cables installed inside a ship's hull generate controlled counter-magnetic fields to neutralize the ship's magnetic signature against magnetic sea mines.
  • Cathodic protection systems utilize sacrificial anodes (zinc or aluminum) or Impressed Current Cathodic Protection (ICCP) to prevent galvanic corrosion of ship hulls in saline seawater.
  • The Varunastra heavyweight torpedo travels at speeds up to 40 knots with an operational range exceeding 40 km, utilizing active-passive acoustic homing to track submerged submarines.
  • The Maareech Advanced Torpedo Defence System (ATDS), developed by NPOL (DRDO), detects incoming enemy torpedoes and fires acoustic decoys to mislead and divert them away from the warship.
  • The Kavach anti-missile decoy system, designed by DRDO and manufactured by Ordnance Factory Board, launches chaff rockets to form radar-reflective clouds to decoy incoming anti-ship cruise missiles.
  • The Project 28 Kamorta-class corvettes feature over 90% indigenous content, utilizing rail-less helo traversing systems and combined diesel and diesel (CODAD) propulsion.
  • The Landing Craft Utility (LCU) Mk-IV vessels, built by GRSE for the Andaman and Nicobar Command, transport main battle tanks, armored vehicles, and troops for amphibious beaching operations.
  • The Deep Submergence Rescue Vehicle (DSRV) systems operated by the Indian Navy can rescue stranded crews from disabled submarines submerged at depths down to 650 meters.
  • INS Nireekshak is a specialized diving support and submarine rescue vessel of the Indian Navy equipped with two deep-submergence decompression chambers and a dynamic positioning system.
  • The Submarine Escape Training Facility 'Abhyas', located at INS Satavahana in Visakhapatnam, trains submariners in escape techniques from distressed submerged submarines.
  • Combined Gas and Gas (COGAG) propulsion systems on Project 15B destroyers utilize four gas turbines to achieve rapid acceleration and top speeds exceeding 30 knots.
  • Combined Diesel and Gas (CODAG) propulsion systems combine fuel-efficient diesel engines for cruising with high-power gas turbines for high-speed combat maneuvers.
  • The Warship Design Bureau (WDB), formerly the Directorate of Naval Design, is the Indian Navy's in-house warship design institution responsible for designing all indigenous naval combat platforms.
  • Goa Shipyard Limited (GSL) is an Indian public sector shipyard specializing in the construction of stealth frigates, offshore patrol vessels (OPVs), and fast missile craft.
  • Cochin Shipyard Limited (CSL) is India's largest commercial and defense shipbuilding facility, having successfully built the aircraft carrier INS Vikrant and anti-submarine shallow water craft.
Curriculum & Reference Sources: Indian Navy Official Records, Mazagon Dock Shipbuilders Limited (MDL), Ministry of Defence Press Releases.

Sample Solved Questions & Concept Explanations

8 Verified Concept Questions
Q1.EASY

Which warship, commissioned in September 2022 at Cochin Shipyard, holds the distinction of being India's first indigenously designed and constructed aircraft carrier?

Q2.MEDIUM

Which submarine holds the historic distinction of being India's first indigenously designed and built nuclear-powered ballistic missile submarine (SSBN)?

Q3.HARD

Under the Indian Navy's Project-75 submarine programme executed at Mazagon Dock Shipbuilders Limited (MDL), six diesel-electric attack submarines were constructed based on the design of which foreign class?

Q4.EASY

Which modified Kiev-class aircraft carrier acquired from Russia and extensively refitted at Sevmash Shipyard was commissioned into the Indian Navy in November 2013 as INS Vikramaditya?

Q5.EASY

What is the name of India's second indigenously built nuclear-powered ballistic missile submarine (SSBN), commissioned into the Indian Navy at Visakhapatnam in August 2024?

Q6.EASY

What does the naval aviation acronym 'STOBAR' stand for in the context of aircraft takeoff and landing on Indian aircraft carriers INS Vikramaditya and INS Vikrant?

Q7.EASY

What does the naval term 'SONAR' stand for, referring to the acoustic system used to detect submerged submarines and sea floor topology?

Q8.EASY

Which historic warship, formerly the British Royal Navy's HMS Hercules, served as India's first aircraft carrier from 1961 to 1997 and played a heroic role in the 1971 Indo-Pak War?