Swan Defence and Heavy Industries Limited engages in the construction of vessels, repairs, and refits of ships and rigs and heavy engineering in India and internationally. The company builds vessels for building large commercial; cargo and niche and specialized vessels; and defence vessels. It also provides solutions for all kinds of ships and structures including large commercial and defence vessels, jack-up rigs, and offshore vessels, as well as steel repairs, and conversions; machinery, piping, electrical, and propeller repairs; tailshaft & rudder service; blasting, coating, and cathodic protection. In addition, the company offers engineering, procurement and construction, as well as loading services from its Offshore Yard. The company was formerly known as Reliance Naval and Engineering Limited and changed its name to Swan Defence and Heavy Industries Limited in January 2025. The company was incorporated in 1997 and is based in Mumbai, India. Swan Defence and Heavy Industries Limited operates as a subsidiary of Hazel Mercantile Limited.