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India begins second phase of indigenous submarine propulsion system testing

The Ministry of Defence announced on 24 October 2026 the start of the 'Setting to Work Phase (STW)-2' for an indigenously developed Air Independent Propulsion (AIP) system Energy Module. This system, developed by the Naval Materials Research Laboratory (DRDO), is designed to increase the underwater endurance of diesel-electric submarines by reducing their need for atmospheric oxygen. Following rigorous testing for power production, the module will be handed over to Mazagon Dock Shipbuilders Limited for integration into Kalvari-class submarines in early 2027.

Key points

  • AIP system reduces diesel-electric submarines' dependence on atmospheric oxygen
  • Developed indigenously by Naval Materials Research Laboratory, DRDO
  • Integration on Kalvari-class Submarines scheduled for early 2027

When it applies

  1. Inauguration ceremony of Setting to Work Phase-2
  2. Integration of AIP system on Kalvari-class Submarine

Who it affects

  • Kalvari-class Submarines