INS Sanshodhak, the fourth and final vessel of the Indian Navy's Survey Vessel (Large) programme, was commissioned on June 21, 2026, alongside INS Dunagiri and INS Agray. Designed by the Navy's Warship Design Bureau and built by GRSE, the ship is dedicated to hydrographic surveys and oceanographic data collection.
Role and Importance of Hydrographic Ships
Unlike combat vessels armed with missiles and torpedoes, Sanshodhak's primary mission is knowledge gathering. It maps the seabed, charts navigational routes, collects oceanographic data, and supports military operations through precise hydrographic surveys. Modern naval warfare depends heavily on accurate underwater information; submarines, warships, and missile systems require detailed knowledge of seabed conditions, water depth, currents, and underwater obstacles. Survey vessels like Sanshodhak create and update these charts, enabling safe navigation for naval commanders while also supporting civilian shipping, ports, and maritime infrastructure projects.
Advanced Equipment and Capabilities
INS Sanshodhak is equipped with a wide range of modern hydrographic and oceanographic equipment, including advanced data acquisition systems, autonomous underwater vehicles, remotely operated vehicles, side-scan sonar systems, and high-precision positioning equipment. It can conduct coastal surveys, deep-water surveys, and seabed mapping operations, and gather environmental and oceanographic information that supports naval planning and submarine operations.
Specifications and Indigenous Content
The vessel displaces about 3,400 tonnes and measures around 110 metres in length. Powered by twin diesel engines, it can achieve speeds exceeding 18 knots while maintaining long-duration survey missions at sea. More than 80 per cent of the ship's content by cost is indigenous, reflecting India's growing shipbuilding capabilities. Its mission systems allow survey teams to generate highly accurate nautical charts and collect geophysical data essential for both military and civilian maritime activities.
Beyond Military Missions
Survey vessels perform far more than defence-related tasks. They assist in safe navigation for commercial shipping, support disaster relief planning, contribute to marine scientific research, and aid the development of ports and offshore infrastructure. The class has also been designed with capabilities that support humanitarian assistance and search-and-rescue operations when required.
Strategic Importance
As India expands its maritime footprint across the Indian Ocean Region, the demand for accurate hydrographic data continues to grow. INS Sanshodhak strengthens the Navy's ability to map strategic waters, support submarine operations, and enhance maritime domain awareness. The vessel may not carry the firepower of INS Dunagiri or the anti-submarine focus of INS Agray, but it provides something equally valuable: information. In the modern maritime battlespace, data is a critical asset.
