On 8th March 2021, DRDO conducted the final development test of Air Independent test of the “Air Independent Propulsion”. The final development test was conducted a day before the INS Karanj (Kalvari-class submarines) was inducted into the Indian Navy.  This is a major step which will make the Indian submarines more lethal. While, INS Karanj will be commissioned on 10th March 2021.

The Air Independent Propulsion allows the submarine to be submerged for a long period under water. This system also makes the sub-surface platform more deadly by turning it quieter than the nuclear submarine. The Indian Navy has planned to retrofit all of its Kalvari class non-nuclear attack with the Air Independent Propulsion system in its first upgrade.

About Kalvari Class Submarine

It is having the weight of 1615 tonne. The submarine is being built by Mazagon Dockyards Ltd (MDL) in association with the French Naval Group. This submarine is based on the Scorpene design.

Air Independent Propulsion

The Air Independent Propulsion is any marine propulsion technology which allows the non-nuclear submarine to operate without providing access to the atmospheric oxygen by surfacing or by using the snorkel. The Air Independent Propulsion system can augment or replace the diesel-electric propulsion system which is used in the non-nuclear vessels. The development of Air Independent Propulsion technology in India by the DRDO is of huge boost for the Atma Nirbhar Bharat campaign because France, China, USA, UK and Russia are already using this technology. The Air Independent Propulsion technology is based on the Phosphoric Acid Fuel Cell. Thus, the Air Independent Propulsion fitted submarine does not require surface for charging its batteries and this way it can remain underwater for long periods.

About INS Karanj

The third submarine is a first batch of six Kalvari-class submarines in the Indian Navy. The submarine is a diesel-electric attack submarine which is based on Scorpene class. INS Karanj has been designed by the French naval defense and energy group. It was manufactured by Mazagon Dock Ltd. INS Karanj was launched on 31st January 2018 and was delivered to Indian Navy in February 2021.

DRDO developed AIP Technology for submarine DRDO developed AIP Technology for submarine