INDIAN NAVY COMMISSIONS INDIGENOUS ANTI-SUBMARINE WARFARE SHALLOW WATER CRAFT INS MANGROL

1. At a Glance

• INS Mangrol (P82) is the third Mahe-class Anti-Submarine Warfare Shallow Water Craft (ASW-SWC). It was commissioned at Naval Dockyard, Mumbai on 12 Oct 2026 [1].
• Cochin Shipyard Limited (CSL), Kochi designed and built it in India. It has over 80% indigenous content, which makes it an example of Aatmanirbhar Bharat / Make in India in defence [1].
• It is built for littoral (coastal, shallow-water) work: anti-submarine warfare, underwater surveillance, Low-Intensity Maritime Operations (LIMO) and mine warfare tasks [1].
• UPSC relevance: GS-III (internal security, coastal security, indigenisation of defence technology). For Prelims, expect ship names, classes, builders and roles.

2. Why in the News

• 12 Oct 2026: INS Mangrol was commissioned at Naval Dockyard, Mumbai. VAdm Sanjay Vatsayan, Flag Officer Commanding-in-Chief (FOC-in-C), Western Naval Command, presided [1].
• 21 Aug 2026: CSL delivered Mangrol to the Indian Navy [8].
• The commissioning is part of a wider induction of ASW-SWCs over 2025–26: Arnala, Androth, Mahe and Anjadip have already been inducted [2][10][13][17].

3. Background & Evolution

• Rationale: India needed small, shallow-draught vessels that can hunt submarines in coastal waters where large frigates and destroyers work poorly. The ASW-SWC class is meant to replace the Abhay-class ASW corvettes [9].
• Two-yard procurement (2019):
• 29 Apr 2019: The Ministry of Defence (MoD) signed a contract with GRSE, Kolkata for 8 ASW-SWCs, worth about ₹6,311 crore. The first ship was due within 42 months and the rest at two ships a year [9].
• 30 Apr 2019: MoD awarded a contract for 8 ASW-SWCs to CSL, Kochi [2].

• Together these make a 16-ship ASW-SWC programme [10].

• Milestones in order:

• 20 Dec 2022: Arnala, the first GRSE ship, was launched at M/s L&T, Kattupalli [12].
• 30 Nov 2023: Mahe, Malvan and Mangrol were launched together at CSL, Kochi [5].
• 29 Jan 2025: The keel of the 7th CSL ship (BY 529, Machilipatnam) was laid [15].
• 8 May 2025: Arnala was delivered [11].
• 18 Jun 2025: INS Arnala was commissioned, the first ASW-SWC in the Navy [10].
• 23 Oct 2025: Mahe was delivered [3].
• 24 Nov 2025: INS Mahe was commissioned at Naval Dockyard, Mumbai, and joined the Western Naval Command [2].
• 27 Feb 2026: INS Anjadip was commissioned at Chennai [13].
• 31 Mar 2026: Malvan ("Malwan" in the delivery release) was delivered [7].
• 21 Aug 2026: Mangrol was delivered [8].

• 12 Oct 2026: Mangrol was commissioned [1].

• Predecessor: The name comes from the earlier INS Mangrol (M85), a minesweeper that served until April 2004 [1].

4. Core Static Facts

Key terms

• ASW-SWC: a small, shallow-draught warship built to find and attack submarines in coastal waters.
• LIMO (Low-Intensity Maritime Operations): maritime policing-type tasks below the level of conventional warfare, such as anti-piracy, anti-infiltration and coastal surveillance.

5. Multi-Dimensional Analysis

Geopolitical / Strategic

• The ship strengthens defence of coastal approaches and maritime domain awareness against underwater threats [1].
• The littoral zone is where submarines are hardest to detect and where blue-water ships are least suited. Shallow-water craft fill that gap [1].
• It supports India's maritime interests and regional stability in the Indian Ocean Region [1].

Scientific / Technological

• The ship carries advanced sensors, sonar and weapon systems for detecting, tracking and countering underwater threats [1].
• Waterjet propulsion gives fast response and agility in confined waters [1].
• CSL handled the full chain from design to construction to systems integration [1].

Economic / Industrial

• Over 80% of the content is indigenous, with contributions from Indian defence industries and MSMEs [1].
• The 16 ships are split between two shipyards (GRSE and CSL), and GRSE has used a private yard (L&T Kattupalli) [9][12]. This widens India's shipbuilding base.

Administrative / Programme Management

• The 2019 contracts set a target of the first ship in 42 months [9]. The first commissioning came only in June 2025 [10], which shows the usual delays in defence shipbuilding.
• The first three CSL ships were launched on the same day [5], which shows modular, parallel construction.

Historical

• Reusing the names of retired ships (Mangrol, M85) keeps naval tradition and continuity [1].

6. Recent Developments (last 12–18 months)

• 18 Jun 2025: INS Arnala commissioned, the first ASW-SWC [10].
• 6 Oct 2025: Androth, the second GRSE ship, scheduled for commissioning [17].
• 23 Oct 2025: Mahe delivered [3].
• 24 Nov 2025: INS Mahe commissioned, the lead ship of the Mahe class [2].
• 27 Feb 2026: INS Anjadip commissioned at Chennai [13].
• 31 Mar 2026: Malvan delivered [7].
• 22 Jul 2026: Malvan scheduled for commissioning, according to a PIB notice [6].
• 21 Aug 2026: Mangrol delivered [8].
• 12 Oct 2026: INS Mangrol commissioned at Mumbai [1].

7. Prelims Hooks

• INS Mangrol has pennant number P82 [1].
• It is the 3rd Mahe-class ASW-SWC [1].
• It was commissioned at Naval Dockyard, Mumbai on 12 Oct 2026 [1].
• Builder: Cochin Shipyard Ltd, Kochi, not GRSE or MDL [1].
• Indigenous content: over 80% [1].
• Propulsion: three diesel-driven waterjets, not conventional propellers [1].
• Roles: ASW, underwater surveillance, LIMO and mine warfare [1].
• Named after Mangrol, Junagadh district, Gujarat [1].
• The earlier INS Mangrol (M85) was a minesweeper that served until April 2004 [1].
• INS Arnala, built by GRSE, was the first ASW-SWC, commissioned on 18 Jun 2025 [10].
• INS Mahe is the lead ship of the CSL batch, commissioned on 24 Nov 2025 [2].
• MoD signed the GRSE ASW-SWC contract on 29 Apr 2019 for about ₹6,311 crore [9]. The CSL contract followed on 30 Apr 2019 [2].
• The ASW-SWC programme has 16 ships: 8 from GRSE and 8 from CSL [9][2][10].
• ASW-SWCs replace the Abhay-class corvettes [9].
• Mahe, Malvan and Mangrol were launched together on 30 Nov 2023 at CSL [5].

8. How Late the Ships Came, and Why This Is an Old Pattern

• The first ship came about two and a half years late
• The 2019 GRSE contract asked for the first ship within 42 months, which is around October 2022 [9].
• Arnala was only launched (put into water, not yet finished) in December 2022 [12]. It was delivered in May 2025 [11].

• So the ship reached the water after the date it was supposed to be handed over complete.

• CSL's first ship took six and a half years from contract

• The CSL contract was signed on 30 Apr 2019 [2]. Mahe, the first CSL ship, was delivered on 23 Oct 2025 [3].

• Mangrol, the third CSL ship, came seven years after the contract [8].

• The same delay has been seen before, and CAG listed the causes

• CAG (Comptroller and Auditor General, the government's auditor) audited Indian warship building in Report No. 32 of 2010. It found lead ships (the first ship of a class) were 4–5 years late [18].
• The reasons it gave were late structural drawings, steel not arriving on time, and weak infrastructure at DPSU shipyards (Defence Public Sector Undertakings, government-owned yards) [18].

• PIB releases do not say why the ASW-SWC programme slipped. A Mains answer should not claim the 2010 causes were repeated. It can say the pattern matches, and that no public reason has been given.

• Why the delay matters in practice

• The ASW-SWCs replace the old Abhay-class corvettes [9]. If the new ships come late, the Navy either keeps ageing ships in service longer or has fewer shallow-water hunters.
• CAG saw this before with anti-submarine corvettes. The first ship came only in July 2014, which left the Navy short of anti-submarine capability for years [19].

9. What "Over 80% Indigenous" Does Not Tell You

• A percentage shows how much is Indian, not which parts are Indian
• PIB says Mangrol has over 80% indigenous content [1][8].
• The releases do not list what makes up the remaining part under 20%.

• In a warship, the most important items are the sonar, the weapons and the engines. If any of these is imported, a high percentage can still leave a key dependence on a foreign supplier.

• Relying on one supplier has delayed ships before

• CAG's 2017 audit of anti-submarine corvette construction linked delays to a single-vendor supply problem (only one company could supply a part) [19].

• The lesson for the ASW-SWC: Aatmanirbharta (self-reliance) should be judged by whether a critical part has more than one source, not only by the headline percentage.

• How to use this in an answer

• Treat "80% indigenous" as real progress [1].
• Then add that the test is which systems are still imported, and that the public releases do not answer this.

10. Two Shipyards, Two Designs: Faster Delivery, Heavier Upkeep

• The gain: two yards really did deliver at the same time
• GRSE delivered Agray on 30 Mar 2026 [22]. CSL delivered Malwan the next day, 31 Mar 2026 [7].
• GRSE had already delivered Anjadip on 22 Dec 2025 [21].

• One yard building all 16 ships could not have handed over ships this close together.

• The cost: one requirement, two different ship classes

• GRSE builds the Arnala class and CSL builds the Mahe class, each to its own design [9][1].

• Two designs mean two sets of spare parts, two training courses for crews, and two sets of repair know-how for the same job.

• Maintenance is already the weak spot

• A refit is a ship's planned period of major repair and upgrade.
• CAG's 2013 audit found that only 28 of 152 Navy refits (18.42%) started on schedule [20].
• Adding 16 new small ships of two designs puts more load on the same repair dockyards. Delivering the ships is only half the work. Keeping them ready for sea is the other half.

11. Mine-Laying Is Not Mine-Clearing

• The old Mangrol cleared mines. The new one is built to lay them
• The earlier INS Mangrol (M85) was a minesweeper, a ship that finds and removes enemy sea-mines from harbours and sea routes. It served until April 2004 [1].

• The new class has "mine warfare tasks" and an advanced mine-laying capability [1][2]. Mine-laying means placing our own mines, which is an attack role.

• Why the difference matters for exam answers

• Reusing the name can make it look as if the old minesweeper's job has been filled again. It has not.
• Clearing enemy mines from ports like Mumbai needs dedicated mine countermeasure vessels. That gap is a separate issue from the ASW-SWC programme (see the note's "Mine countermeasure vessel gap" item in Section 9).
• In Mains, do not write that ASW-SWCs solve India's mine-clearing problem.

12. Anchors for Answers

• Data: GRSE contract required the first ship within 42 months, but Arnala was delivered in May 2025, about 2.5 years late [9][11]
• Data: Over 80% indigenous content in INS Mangrol [1]
• Data: Only 28 of 152 naval refits (18.42%) began on time (CAG 2013) [20]
• Report/Committee: CAG Report No. 32 of 2010, Indigenous Construction of Indian Naval Warships: lead ships 4–5 years late because of late drawings, steel shortages and weak DPSU yard infrastructure [18]
• Report/Committee: CAG Report No. 19 of 2017: anti-submarine corvette delays linked to dependence on a single vendor [19]
• Scheme: Aatmanirbhar Bharat / Make in India in defence: the 16-ship ASW-SWC order is split between two Indian yards, and GRSE also uses a private yard (L&T Kattupalli) [9][12]

13. Mains Relevance

• GS-III: "Security challenges and their management in border areas" (coastal security); "Various security forces and agencies and their mandate"; "Science & Technology: indigenisation of technology and developing new technology."
• GS-II (secondary): India's maritime role in the Indian Ocean Region.
• Possible question stems: 1. Littoral waters are emerging as the weakest link in India's maritime security architecture. Examine the role of indigenous shallow-water ASW platforms in addressing this gap. (15 marks) 2. Indigenous warship building has moved from 'buyer's navy' to 'builder's navy'. Critically evaluate with reference to recent commissionings and persisting bottlenecks. (15 marks) 3. Discuss how MSMEs and defence PSUs together contribute to Aatmanirbharta in defence manufacturing. (10 marks)

14. Related Topics to Study Next

• Arnala-class (GRSE) ASW-SWCs: the other half of the same 16-ship programme.
• Project 17A / Project 15B: the blue-water counterparts of indigenous shipbuilding.
• Coastal security architecture after 26/11: the setting in which littoral ASW and LIMO matter.
• Positive Indigenisation Lists (MoD) and Defence Acquisition Procedure 2020: the policy basis for indigenous content.
• SAGAR / MAHASAGAR doctrine: India's strategic vision for the Indian Ocean.
• Chinese submarine activity in the IOR: the threat that drives ASW investment.
• Mine countermeasure vessel gap: relevant because the old Mangrol (M85) was a minesweeper and the new craft still has mine-warfare roles.

15. NCERT Concepts to Revise

• Comptroller and Auditor General (Polity): The note's delay and refit evidence comes from CAG audit reports, so know who the CAG is.
• Performance audit (Polity): CAG's 2010 warship report was a performance audit judging whether programmes met objectives efficiently, as the delay analysis does.
• Self-reliance (Economy): The ship is presented as Aatmanirbhar Bharat; the note asks whether 80% indigenous content truly reduces foreign dependence.
• Public sector undertaking (Economy): Builders CSL and GRSE are defence PSUs; CAG blamed weak PSU shipyard infrastructure for delays.
• Indian Ocean (Geography): The ship defends coastal approaches and supports India's maritime interests and stability in the Indian Ocean Region.

16. Common Errors / Trap Areas

• Builder confusion: the Mahe class is built by CSL. The Arnala class is built by GRSE, partly at L&T Kattupalli. Neither is built by Mazagon Dock [2][9][12].
• "First ASW-SWC": Arnala (June 2025) was the first overall. Mahe was the first of the CSL batch [10][2].
• Old vs new Mangrol: M85 was a minesweeper decommissioned in 2004. P82 is the new ASW-SWC [1].
• Location: the ship was commissioned at Mumbai (Western Naval Command), not Kochi where it was built [1].
• Specification and spelling differences: PIB gives displacement as both ~900 t and ~1,100 t [5][2]. The second ship appears as both "Malvan" and "Malwan" [5][7]. In MCQs, anchor on length (78 m) and speed (25 knots).