Mazagon Dock Shipbuilders Limited is an India-based shipbuilding yard company, which is principally engaged in the building and repairing of ships, submarines, various types of vessels, and related engineering products for its customers. It is also engaged in the production of defense equipment. The Company's segments include Shipbuilding (New Construction and Ship Repairs) and Submarine. Its Shipbuilding segment includes the building and repair of Naval ships. Its Submarine segment includes the building, repair and refits of diesel and electric submarines for the Indian Navy. It provides cargo ships, passenger ships, supply vessels, multipurpose support vessels, water tankers, tugs, dredgers, fishing trawlers, barges, and border outposts. The Company caters to both national and international customers in the defense sector as well as civil operations. It offers supply chain management, tug support, and yard services and berth facilities for repairs and refits of commercial vessels.