In addition to aircraft carriers and large amphibious assault ships, the Indian Navy is acquiring numerous surface combatants such as; the Visakhapatnam-class destroyers, Project 17A-class[298] and Admiral Grigorovich-class[299] frigates, ASW shallow water corvettes,[300] ASuW corvettes,[301] and MCM vessels.[302] New submarine types include; the conventional Kalvari class,[303] Project 75I,[304] and the nuclear Arihant class.[305] New auxiliary ships include; five Replenishment Oilers, a Missile Range Instrumentation Ship and an Ocean Surveillance Ship.[306]