Mazagon Dock Shipbuilders, a state-run defence giant, has announced it'll acquire a 51% controlling stake in Colombo Dockyard, a major shipbuilding firm in Sri Lanka, Moneycontrol reported. The deal is worth ₹452 crore. The transaction will close within six months, after which the Sri Lankan shipbuilder will become part of Mazagon Dock Shipbuilders, according to a regulatory filing on Friday.