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Sagar Manthan enters the water before trials and ocean research

English हिंदी ಕನ್ನಡ മലയാളം தமிழ் తెలుగు

First brief 9 Sep, 7:23 pm IST Updated 9 Sep, 7:23 pm IST 1 development 2 min read Latest ↓

Conceptual illustration of a surface research ship lowering a scientific instrument; not a depiction of Sagar Manthan — Illustration: Clarity / ChatGPT image generation · Clarity illustration

Where it stands

India’s new ocean research vessel, Sagar Manthan, was launched in Kolkata on 9 September 2026. Launch means the vessel entered the water for the next construction phase; it has not begun operational research. Garden Reach Shipbuilders & Engineers is building it for the National Centre for Polar and Ocean Research. The ship will support seabed surveys, water sampling and atmospheric observations. Its superstructure, systems and sea trials still need completion. Delivery for commissioning is scheduled for 2028. The vessel is intended to gradually replace the ageing Sagar Kanya, not withdraw that older ship immediately.

Background

Studying the ocean requires more than images of its surface. Scientists need measurements of seawater, the atmosphere and the seabed. Research ships carry instruments and laboratories to collect those observations during voyages. India’s Sagar Kanya has served this purpose since 1983. As that vessel ages, the country needs a newer platform for demanding surveys. Sagar Manthan is being built domestically under the Deep Ocean Mission. Its planned capabilities would help collect scientific data, but launching the hull is only one step towards a usable research ship.

How it developed

July 2024–April 2026: construction milestones

How it started
A domestic shipbuilding project prepares to replace an ageing platform

The construction contract was signed in July 2024. Steel cutting followed on 29 November 2024, and the keel was laid on 8 April 2026. These stages turned the design into the vessel’s physical structure. The project forms part of the Deep Ocean Mission’s survey and exploration work. The ministry plans a gradual replacement of Sagar Kanya, which entered service in 1983.

Government of India / PIB
9 September 2026: vessel launched in Kolkata

New fact
Launch begins the next construction phase, not research operations

On 9 September 2026, Sagar Manthan entered the water at Kolkata’s Rishi Bankim Shipyard. The launch moved the vessel towards further construction and equipment installation. Superstructure work, system integration and extensive sea trials will follow. Delivery for commissioning to NCPOR is scheduled for 2028. Its planned tools include seabed-mapping systems, water sampling equipment and facilities for underwater vehicles. These capabilities will become operational only after the remaining work and tests.

Government of India / PIB DD India

Why it matters for UPSC

GS3 · Science and technologyGS3 · Ocean resources

For GS3, connect ocean science, indigenous shipbuilding and the Deep Ocean Mission. Distinguish a surface research vessel from an underwater vehicle. Launch, sea trials and commissioning are separate milestones.

Key terms

Ocean research vesselA surface ship equipped to support scientific observations and sampling at sea. Scientists can lower instruments or deploy underwater vehicles from the ship. The ship itself does not dive to the seabed.

Launch and commissioningLaunch puts a ship into the water while construction may still continue. Trials then test its systems and performance. Commissioning brings the completed vessel into service. Sagar Manthan was launched on 9 September 2026; delivery for commissioning is scheduled for 2028.

National Centre for Polar and Ocean Research (NCPOR)An institution under India’s Ministry of Earth Sciences that undertakes polar and ocean research. Sagar Manthan is being built for it. The institution will receive the vessel after further construction and trials.

Deep Ocean MissionIndia’s programme for developing capabilities to study and explore the deep ocean. Sagar Manthan belongs to its deep-ocean survey and exploration component. A research platform can gather data about resources and environmental conditions; that is different from beginning commercial seabed mining.

Multibeam bathymetryMapping the depth and shape of the seabed using many sound beams. Their echoes help measure a strip of the sea floor as the ship moves. The planned system supports surveys; it is not a camera taking ordinary photographs through kilometres of water.

Water-column samplingCollecting seawater or measurements at different depths between the surface and seabed. Conditions can vary with depth, so a surface sample alone cannot describe the whole ocean below. The vessel will support this layered investigation.

Remotely operated and autonomous underwater vehiclesUnderwater machines used for observation or other research tasks. A remotely operated vehicle is controlled from a supporting platform; an autonomous vehicle follows programmed tasks. Sagar Manthan is designed with deployment facilities for both. These are tools carried by the ship, not alternative names for the ship.

Environmental baselineMeasurements describing conditions before a later activity or change. Repeated measurements can then show what changed. Establishing ocean baselines is a planned research role; collecting them does not itself prove that future resource extraction would be harmless.

Sources (2)

Government of India / PIB · official · Launch of ORV Sagar Manthan and remaining construction milestones, 9 September 2026
DD India · official · India launches advanced ocean research vessel Sagar Manthan in Kolkata