For the existing Sea King Mk42Bs and Ka-28PLs to be upgraded at a cost of Rs6 billion and Rs8.5 billion, respectively, the only ultra low-frequency dipping sonar being offered for the selected helicopter is L-3 Communications’ Ocean Systems Division’s HELRAS DS-100, while low-frequency sonars being offered are THALESRaytheon’s FLASH and the DRDO-developed/BEL-built Mihir.
