Current Affairs · · Prelims · Science & Technology

INS Mangrol strengthens India's coastal anti-submarine warfare capabilities

The Indian Navy commissioned INS Mangrol, the third Mahe-class Anti-Submarine Warfare Shallow Water Craft, in Mumbai on 12 October 2026. Built by Cochin Shipyard Limited with over 80% indigenous content, the vessel strengthens underwater surveillance and submarine detection near India's coasts, ports and strategic maritime installations.

Event date:

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  1. Context1 / 5
    • The Indian Navy commissioned INS Mangrol (P82) on 12 October 2026 at the Naval Dockyard, Mumbai.
    • It is the third Mahe-class Anti-Submarine Warfare Shallow Water Craft (ASW-SWC), built by Cochin Shipyard Limited (CSL), Kochi.
    • The vessel contains over 80% indigenous content and is designed to detect, track and counter underwater threats in shallow coastal waters.
    • It is named after Mangrol, a coastal town and fishing harbour in Junagadh district, Gujarat.
    • It strengthens coastal defence near naval bases, ports and other important maritime installations.
  2. Key highlights2 / 5

    INS Mangrol belongs to a class designed for coastal anti-submarine operations. The specifications below are published Mahe-class design figures.

    FeatureDetails
    ClassMahe-class
    TypeAnti-Submarine Warfare Shallow Water Craft
    BuilderCochin Shipyard Limited, Kochi
    Length78 metres
    Maximum speed25 knots
    Endurance1,800 nautical miles
    PropulsionThree diesel engine-driven waterjets
    Indigenous contentOver 80%

    Weapons and sensors

    • Abhay hull-mounted sonar: Uses underwater sound to help detect and locate objects.
    • Lightweight torpedoes: Weapons for engaging hostile submarines.
    • Indigenous anti-submarine rocket launcher: Delivers weapons against underwater threats.
    • Maareech torpedo decoy system: Helps defend against incoming torpedoes.

    The craft is also designed for underwater surveillance, low-intensity maritime operations and mine warfare-related tasks. This does not establish that it can independently perform every kind of mine-clearing operation.

  3. Note3 / 5

    Why a dedicated shallow-water craft matters

    • Protecting coastal approaches: Submarines can threaten ports, harbour entrances, naval bases and offshore installations.
    • Difficult detection conditions: Seabed echoes, underwater noise and heavy shipping traffic make sonar detection more challenging near the coast.
    • High manoeuvrability: A relatively small vessel with shallow draught can operate where larger warships face limitations.
    • Working with other platforms: The craft can coordinate with maritime patrol aircraft, helicopters and other naval vessels.
    • Freeing larger warships: Specialised coastal patrols let larger vessels concentrate on wider operations at sea.

    Example: Sonar-equipped craft can monitor the underwater approach to a naval harbour, where an approaching submarine may be hard to detect.

  4. Key concepts4 / 5

    1. Anti-Submarine Warfare (ASW)

    Operations to detect, track, deter and counter hostile submarines using vessels, aircraft, sensors and underwater weapons.

    2. Sonar — Sound Navigation and Ranging

    Uses sound underwater. Active sonar sends pulses and listens for their echoes; passive sonar listens for sound without transmitting pulses.

    3. Littoral waters

    Coastal and near-shore waters, often shallow, where seabed conditions and marine traffic affect naval operations.

    4. Maritime Domain Awareness (MDA)

    Knowledge of activities, movements and possible threats at sea, gathered through surveillance and information-sharing.

    Prelims distinction: Radar uses electromagnetic waves; sonar uses sound waves and is particularly useful for detecting underwater objects.

  5. Note5 / 5

    India's 16-vessel ASW-SWC programme

    Two Indian shipyards have contracts to build eight craft each.

    ClassBuilderVessels
    Mahe-classCochin Shipyard Limited, Kochi8
    Arnala-classGarden Reach Shipbuilders & Engineers, Kolkata8
    TotalTwo Indian shipyards16
    • The new programme is intended to replace ageing Abhay-class anti-submarine vessels.
    • Domestic construction builds expertise in ship design, sonar integration and defence manufacturing.
    • Greater indigenous production can reduce dependence on foreign equipment and support Indian suppliers.

    Suggested priorities

    • Improve coordination between coastal sensors, naval ships and patrol aircraft.
    • Continue joint naval training for detecting underwater threats.
    • Strengthen domestic capability in sonar, underwater weapons and maintenance.

    Final takeaway: INS Mangrol improves India's dedicated coastal submarine-surveillance capability while supporting indigenous warship construction.

Sources

Syllabus

PaperSubjectSub-topic
PrelimsScience & TechnologyDefence Technology; Indian Navy, sonar, warship classes and indigenous naval systems
GS3Science & TechnologyTechnology indigenisation and domestic warship and underwater sensor development
GS3Internal SecuritySecurity challenges and management in coastal and maritime areas

Topics

IndustryInternational Relations and Current AffairsDefence Technology

Practice questions

  1. With reference to INS Mangrol, consider the following statements: 1. It belongs to the Mahe-class of Anti-Submarine Warfare Shallow Water Craft. 2. It was constructed by Cochin Shipyard Limited. 3. It is primarily designed for launching ballistic missiles. Which of the statements given above are correct?

    1. 1 and 2 only
    2. 2 and 3 only
    3. 1 and 3 only
    4. 1, 2 and 3
    Show answer

    Answer: A. Statements 1 and 2 are correct: INS Mangrol is a Mahe-class coastal anti-submarine craft built by Cochin Shipyard Limited. Statement 3 is incorrect: its primary mission is underwater surveillance and countering submarines, not launching ballistic missiles.

    Difficulty: easy · statement

  2. Consider the following statements about sonar technology: 1. Sonar uses sound waves to detect underwater objects. 2. Active sonar transmits sound pulses and detects returning echoes. 3. Passive sonar must continuously transmit sound pulses to locate submarines. Which of the statements given above are correct?

    1. 1 only
    2. 1 and 2 only
    3. 2 and 3 only
    4. 1, 2 and 3
    Show answer

    Answer: B. Statements 1 and 2 are correct: sonar uses sound, and active sonar looks for echoes of transmitted pulses. Statement 3 is incorrect: passive sonar listens for underwater sound without sending pulses.

    Difficulty: easy · statement

  3. Consider the following pairs of warship classes and builders: 1. Mahe-class — Cochin Shipyard Limited 2. Arnala-class — Garden Reach Shipbuilders & Engineers 3. Mahe-class — Mazagon Dock Shipbuilders Limited How many of the above pairs are correctly matched?

    1. Only one
    2. Only two
    3. All three
    4. None
    Show answer

    Answer: B. Pairs 1 and 2 are correctly matched. Mahe-class vessels are being constructed by Cochin Shipyard Limited and Arnala-class vessels by Garden Reach Shipbuilders & Engineers. Pair 3 is incorrect: Mazagon Dock Shipbuilders Limited is not the builder of the Mahe class.

    Difficulty: medium · statement

Mains practice

Answer-writing practice on this article. Attempt it first, then open the hints.

  1. GS3 · 150 words

    Examine the importance of indigenous Anti-Submarine Warfare Shallow Water Craft in strengthening India's maritime security and coastal defence capabilities.

    Show hints
    1. Explain how shallow coastal waters can conceal submarines near ports, shipping lanes and naval bases.
    2. Describe the role of hull-mounted sonar, underwater weapons and manoeuvrable shallow-water craft.
    3. Show how these craft can work alongside patrol aircraft, helicopters and larger warships.
    4. Use the two eight-vessel shipbuilding contracts to explain domestic design, construction and technology integration.
    5. Discuss improved coastal surveillance, Indian industrial capacity and continued investment in indigenous defence systems.