FOURTH SURVEY VESSEL (LARGE) ‘SANSHODHAK’ DELIVERED TO INDIAN NAVY AT GRSE KOLKATA

1. At a Glance

• Sanshodhak is the fourth and final ship of the Survey Vessel (Large) [SVL] project, delivered to the Indian Navy on 30 Mar 2026 by Garden Reach Shipbuilders & Engineers (GRSE), Kolkata, completing the four-ship class [S1].
• Designed by the Indian Navy's Warship Design Bureau (WDB) with >80% indigenous content, the class is a flagship Aatmanirbhar Bharat defence shipbuilding output [S1][S2].
• Primary task: full-scale coastal & deep-water hydrographic survey, supporting safe navigation, EEZ mapping, and oceanographic/geophysical data collection for defence & civil use [S1][S2].

2. Why in the News

• Delivery of Sanshodhak (Yard 3028) on 30 Mar 2026 completes the four-ship SVL contract signed on 30 Oct 2018 [S1].
• Follows commissioning of sister ships INS Sandhayak (03 Feb 2024), INS Nirdeshak (18 Dec 2024) and INS Ikshak (06 Nov 2025) [S1].

3. Background & Evolution

• Contract signed: 30 Oct 2018 between MoD and GRSE for 4 SVL ships to replace ageing Sandhayak-class (1981) hydrographic ships [S1].
• Launches: Sandhayak (05 Dec 2021), Nirdeshak (26 May 2022), Ikshak (26 Nov 2022); Sanshodhak launched 13 Jun 2023 at L&T Kattupalli (built by GRSE in collaboration with L&T) [S3][S2].
• Class certified by Indian Register of Shipping (IRS) [S1].

4. Core Static Facts

5. Multi-Dimensional Analysis

Strategic / Security - Hydrographic data underpins safe naval navigation, submarine ops, missile launch corridors and amphibious landings — a force-multiplier in the Indian Ocean Region (IOR) [S1]. - Strengthens India's SAGAR vision (Security and Growth for All in the Region) by enabling survey support to friendly IOR littorals (Sri Lanka, Maldives, Mauritius, Seychelles) [S1].

Scientific / Technological - Carries multi-beam echo sounders, side-scan sonars, autonomous underwater vehicles, DGPS for deep-water bathymetry [S2]. - Collects oceanographic & geophysical data for both defence and civilian applications (port development, seabed mapping, climate research) [S1].

Economic / Industrial - Demonstrates the Make-in-India defence-shipbuilding ecosystem: GRSE (lead), L&T Kattupalli (sub-contractor for Sanshodhak), SAIL (steel), MSMEs across the supply chain [S1][S2]. - Reinforces GRSE's order book and India's defence export potential in survey/hydrographic platforms.

Administrative / Governance - A rare example of a DPSU-private (GRSE–L&T) collaborative warship build — a model for capacity augmentation under the Defence Acquisition Procedure (DAP) 2020 [S2]. - Replaces the first-generation Sandhayak-class (1981–96) which is being progressively decommissioned.

6. Recent Developments (12-18 months)

• 30 Mar 2026 — Sanshodhak delivered to Indian Navy at GRSE [S1].
• 06 Nov 2025 — INS Ikshak commissioned (third SVL) [S1].
• 18 Dec 2024 — INS Nirdeshak commissioned (second SVL) [S1].
• 03 Feb 2024 — INS Sandhayak commissioned at Visakhapatnam by Raksha Mantri (first SVL) [S1].

7. Prelims Hooks

• Sanshodhak is the 4th and final ship of the SVL project [S1].
• SVL ships designed by Warship Design Bureau (WDB) of the Indian Navy, not DRDO [S1].
• Lead builder: GRSE Kolkata (a Navratna DPSU under MoD) [S1].
• Contract date: 30 October 2018 [S1].
• Class name: Sandhayak-class [S2].
• Hull steel: DMR-249A, produced by SAIL [S2].
• Indigenous content: over 80% [S1].
• Displacement: 3,400 tonnes; Length 110 m [S2].
• Range: 6,500 nautical miles [S2].
• Carries one Advanced Light Helicopter (ALH) [S2].
• Certifying authority: Indian Register of Shipping (IRS) [S1].
• Order of commissioning: Sandhayak (Feb 2024) → Nirdeshak (Dec 2024) → Ikshak (Nov 2025) → Sanshodhak (delivered Mar 2026) [S1].
• Sanshodhak was launched at L&T Kattupalli on 13 Jun 2023 [S3].
• Replaces older Sandhayak-class (1981 vintage) survey ships [S2].

8. Mains Relevance

• GS-III — Defence: Indigenisation of defence production; Internal Security; Role of technology in security.
• GS-II — IR: India's IOR strategy, SAGAR, hydrographic diplomacy.
• Probable stems: 1. "Indigenous warship design and construction has emerged as a cornerstone of Aatmanirbhar Bharat. Discuss with reference to the Survey Vessel (Large) project." 2. "Hydrographic capability is a quiet but critical pillar of India's maritime strategy in the Indian Ocean Region. Examine." 3. "Evaluate the role of DPSU–private sector collaboration in accelerating naval shipbuilding."

9. Related Topics to Study Next

• Project 17A (Nilgiri-class frigates) — parallel indigenous warship programme.
• Project 75/75I submarines — indigenous submarine construction at MDL.
• National Hydrographic Office, Dehradun — agency that uses SVL outputs.
• SAGAR & SAGARMALA — IOR maritime doctrine and port-led development.
• DMR-249A steel & SAIL — indigenous warship-grade steel.
• Warship Design Bureau, Indian Navy — in-house design capability.
• Defence Acquisition Procedure (DAP) 2020 — procurement framework.
• GRSE, MDL, GSL, HSL, CSL — major Indian defence shipyards.

10. Common Errors / Trap Areas

• Sandhayak-class confusion: Two Sandhayak-classes exist — the 1981 (old) and the 2023 (new SVL). New class replaces the old [S2].
• Designer mix-up: Designed by Navy's WDB, NOT DRDO or GRSE in-house [S1].
• Delivery vs commissioning: Sanshodhak was delivered 30 Mar 2026 — it is not yet commissioned as INS [S1].
• Build location: Though a GRSE Kolkata contract, Sanshodhak was launched at L&T Kattupalli (Tamil Nadu) under sub-contracting — likely Prelims trap [S3].
• Aircraft confusion: Carries ALH (Dhruv), not a Sea King/MH-60R [S2].

11. Sources

• [S1] FOURTH SURVEY VESSEL (LARGE) 'SANSHODHAK' DELIVERED TO INDIAN NAVY AT GRSE KOLKATA — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2247145 — (tier: 1)
• [S2] INDIAN NAVY TO COMMISSION 'IKSHAK', CHARTING A NEW COURSE IN INDIGENOUS HYDROGRAPHIC EXCELLENCE — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2186562 — (tier: 1)
• [S3] LAUNCH OF 'SANSHODHAK', FOURTH SHIP OF SURVEY VESSEL (LARGE) PROJECT AT M/s L&T, KATTUPALLI ON 13 JUN 23 — https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=1932038 — (tier: 1)
• [S4] FIRST SHIP OF SURVEY VESSEL (LARGE) SANDHAYAK DELIVERED TO INDIAN NAVY — https://www.pib.gov.in/PressReleasePage.aspx?PRID=1982348 — (tier: 1)
• [S5] INS Sandhayak commissioned into Indian Navy at Visakhapatnam — https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=2002179 — (tier: 1)