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Made in India, built for depths: Navy gets first homemade deep-dive vessel (DSC A20)

Made in India, built for depths: Navy gets first homemade deep-dive vessel (DSC A20)

Mathrubhumi English 5 months ago

The Indian Navy has inducted DSC A20, its first diving support vessel, built entirely in India by Titagarh Rail Systems,Kolkata. It helps naval divers in underwater rescue, repair, and maintenance tasks.

This is a proud moment for our country because it shows we can now build advanced naval equipment right here at home, without depending on other nations.

As informed, the commissioning ceremony was held on December 16, 2025, at Naval Base, Kochi. The vessel had already been delivered in September this year. The event was led by Vice Admiral Sameer Saxena, head of the Southern Naval Command, and hosted by Vice Admiral Sanjay Sadhu. Senior Navy officers, Titagarh Rail Systems officials, and special guests were present to mark this historic occasion.

The Indian Defence Ministry signed a contract with Titagarh Rail Systems, Kolkata, on February 12, 2021, to build five diving support vessels for the Indian Navy. This means DSC A20 is just the first of five such vessels that will strengthen our naval capabilities in the coming years.

During the design stage, the vessel underwent water-flow tests, also known as hydrodynamic analysis, at NSTL, Visakhapatnam. This means artificial waves and currents were created to check how the ship cuts through water, stays balanced, and remains safe at sea.

These tests are crucial because a diving support vessel must remain extremely stable even in rough waters, as divers depend on it for their safety underwater.

DSC A20 was designed and built by following the safety and quality standards set by the Indian Register of Shipping (IRS), ensuring the vessel is strong, safe, and reliable at sea.

The vessel uses a catamaran design, meaning it has two separate hulls (main floating bodies of the ship) running side by side, giving better balance and greater stability at sea. This twin-hull design is particularly important for diving operations because it prevents the vessel from rocking too much when divers are entering or exiting the water.

Now, you might wonder why we need special diving support vessels when regular boats or ships exist. The answer lies in the unique requirements of underwater operations. Regular ships are designed to move from one place to another, but diving support vessels are floating workstations. They need to stay perfectly still at one spot for hours while divers work below. They carry specialized equipment like air compressors, communication systems, and safety chambers that regular vessels don't have. Think of it like the difference between a regular car and an ambulance, both have wheels and engines, but an ambulance has life-saving equipment and serves a completely different purpose.

The craft is fitted with modern diving equipment to support underwater repairs, safety checks, harbour cleaning, and important diving missions in coastal waters. The commissioning of Diving Support Craft (DSC), DSC A20 is a major step in the Indian Navy's Made-in-India shipbuilding drive and supports the government's Aatmanirbhar Bharat (self-reliant India) mission. Building this special ship in India shows the growing strength of India's defence industry and the clear effort to depend less on foreign equipment.

The craft has a two-man Recompression Chamber (RCC) (used after a dive, not underwater, to safely normalise body pressure). This ensures safe recovery after deep dives. Navy divers can operate 30-60 metres deep, enabling longer, safer underwater missions and stronger sea security. When divers come up too quickly from deep water, nitrogen bubbles can form in their blood, causing serious illness. The RCC gradually brings their body back to normal pressure, preventing this dangerous condition.

The vessel can check and repair ships underwater, carry out search and rescue diving, help in recovering damaged objects in harbours and coastal areas, and provide training support for Navy divers. The vessel will be very important for daily upkeep and emergency underwater work, helping the Indian Navy stay better prepared for all situations. Whether it's fixing a ship's propeller without bringing it to dry dock or searching for sunken equipment, DSC A20 makes these tasks faster and more efficient. This achievement reflects our nation's growing technological confidence and our commitment to building a self-reliant defence infrastructure that protects our vast coastline.

The author is a Defence, Aerospace & Geopolitical Analyst

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