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4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC

Source : Indian Defence Analysis

4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC

4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC

Indian Navy has planned to build 16 ASW-SWC. CSL & GRSE had signed the contract for the construction and supply of ASW-SWCs in April 2019, with each ship builders constructing 8 ASW-SWC.

At present, Cochin Shipyard Limited is constructing 3 warships. GRSE has launched 2 warship and constructing 3 warships. Arnala & Androth, the 1st & 2nd ships of the Project, were launched on 20 Dec 22 & 21 Mar 23 respectively.

On 13th June 2023, GRSE has launched 3rd ship of Anti-Submarine Warfare Shallow Water Craft called Anjadip. The keel for the 7th ASW SWC ship was also laid.

Anti-Submarine Warfare Shallow Watercrafts (ASW-SWC)

The ASW-SWC is equipped with sophisticated sonar equipment, including a hull-mounted sonar (HMS) and towed low-frequency variable-depth sonar (LFVDS) for detecting and intercepting hostile submarines.

These vessels are not only capable of detecting submarines, but they can also detect mines laid by submarines and midget submarines.

In addition, it has capability to interdict and destroy subsurface targets in coastal waters. These ships can also perform search and rescue operations during both day and night in coastal areas, defend intruding aircraft, and lay mines on the seabed.


Each ship has a deep displacement of 750 tons, length of 77.6m and width of 10.5m. The vessel will have a maximum speed of 25 knots (46 km/h) and range of 1,800 nautical miles (3,300 km) at 14 knots (26 km/h).

The vessels will be armed with 1 x RBU-6000 anti-submarine rocket launcher, 6 × Lightweight ASW Torpedo and Anti-submarine mines (launched from mine-laying rails). It also features a 30mm naval gun and two 12.7 mm M2 Stabilized Remote Controlled Gun.

4th Survey Vessel launch

‘Sanshodhak’, the fourth of four ships of Survey Vessels (Large) (SVL) Project, being built by L&T/ GRSE for Indian Navy was launched on 13 Jun 23 at Kattupalli, Chennai.

The contract for building four SVL ships was signed between MoD and Garden Reach Shipbuilders & Engineers (GRSE), Kolkata on 30 Oct 18. As per the build strategy, the first ship would be built at GRSE, Kolkata and construction of the remaining three ships upto outfitting stage, has been subcontracted to M/s L&T Shipbuilding, Kattupalli. The first three ships of the project, Sandhayak, Nirdeshak and Ikshak were launched on 05 Dec 21, 26 May 22 and 26 Nov 22 respectively.

SVL ships will replace the existing Sandhayak Class survey ships, with new generation hydrographic equipment, to collect oceanographic data. The hull of these ships is made from indigenously developed DMR 249-A steel manufactured by Steel Authority of India Limited. The Survey Vessel is signing example of Make-In-India with 80% indigenous content by cost.

These modern, indigenously developed 110-metre long and 16-metres wide vessels have a displacement of nearly 3,400 tonnes and can attain a top speed of 18 knots with an endurance of 6,500 nautical miles.

The ship can be fitted with a CRN 91 naval gun. The Close Range Naval-91 is a naval version of the Medak 30mm automatic gun. With a range of 4km, the gun has a rate of fire of 200-300 rounds per minute.

The vessels are equipped with highly advanced state-of-the-art hydrographic equipment & sensors including a Hello Hanger to accommodate one Advanced Light Helicopter. With the capability to carry four Survey Motorboats and an integral helicopter these ships can undertake full-scale coastal and deep-water hydrographic surveys of Ports and navigational channels. This help in the mapping and determination of navigational channels/routes. In addition, the vessels can undertake surveys of maritime limits up to exclusive economic zone (EEZ). These vessels are deployed for collection of oceanographic and geophysical data for defence applications. 4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC 4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC 4th Survey Vessel Large, 3rd ASW-SWC launched and Keel laid for 7th ASW-SWC IgMp



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