What is INS Nipun, why does India need deep-diving vessels, and are they on schedule?

INS Nipun is a specialised vessel designed for deep-sea diving, underwater intervention, salvage and submarine rescue operations

The Indian Navy commissioned INS Nipun, a new diving support vessel, in Mumbai. This vessel enhances deep-sea diving and submarine rescue operations for the Western fleet. INS Nipun joins its sister ship INS Nistar, completing a two-coast capability. Built domestically, the ship supports saturation diving and submarine