, and . Khukri-class corvettes MDL designed and built the first two vessels of the s for the Indian Navy. The lead vessel of the class was commissioned on 23 August 1989, and the second, , on 7 June 1990. The remainder of the class was built at Garden Reach Shipbuilders and Engineers (GRSE) following a transfer of technology from MDL to diversify warship building capabilities to other yards, as well as to make room at MDL for larger projects. Delhi-class destroyers The next class of vessels designed and built by MDL was Project 15 guided-missile destroyers. These were powered by gas turbines and displaced 6,200 tonnes. The first of the class, , was launched in February 1991 and commissioned on 15 November 1997. The second, , was commissioned on 2 June 1999, followed by the last ship in the series, , on 22 January 2001. Shivalik-class frigates The 6000-ton (Project 17) frigates are the first warships with stealth features to be designed and built in India. These multi-role, guided-missile frigates have reduced radar signature and have entered service from 2010 onwards. At least three of this class have been constructed at MDL. The lead vessel of the class was commissioned on 29 April 2010. The last ship of the class, INS Sahyadri, was launched on 27 May 2005 and commissioned on 21 July 2012. Kolkata-class destroyers vessels are the next-generation of guided-missile destroyers in the 7,400-tonne range to be designed and built at MDL. They incorporate stealth features. The lead vessel of the class was launched on 30 March 2006. At least three vessels of the class were planned. All three are in active service. Visakhapatnam-class destroyers vessels are the next-generation of guided-missile destroyers in the 7,500-tonne range to be designed and built at MDL. They incorporate stealth features and improved weapons and avionics compared to the Kolkata class. The lead vessel of the class was launched in 2018. At least four vessels of the class are planned. Nilgiri-class frigates vessels are the next-generation of guided-missile Frigates in the 6,500-tonne range to be designed and built at MDL and GRSE. They incorporate stealth features. The lead vessel of the class was launched on 28 September 2019. At least seven vessels of the class are planned. Four will be built by MDL, while the rest three by GRSE. Coast Guard vessels The yard builds offshore patrol vessels (OPVs) for the