- The Indian Navy and DRDO achieved a major milestone for the indigenous Air Independent Propulsion (AIP) system by inaugurating the Setting to Work Phase-2 Activity. - The AIP system is being developed by Naval Materials Research Laboratory (NMRL) with Larsen & Toubro (L&T) as the manufacturing partner. - AIP significantly enhances the submerged endurance and stealth capabilities of diesel-electric submarines by allowing them to stay underwater longer without surfacing for air. - This initiative is a critical step towards Aatmanirbhar Bharat (self-reliance) in cutting-edge naval defense technologies. - **Air Independent Propulsion (AIP) System:** A technology that allows conventional diesel-electric submarines to operate underwater for extended periods without surfacing to recharge batteries, significantly enhancing underwater endurance and stealth. - **Naval Materials Research Laboratory (NMRL):** A premier research laboratory under DRDO specializing in advanced materials and technologies for naval applications, including the development of the indigenous fuel-cell-based AIP system. - **Defence Research and Development Organisation (DRDO):** India's apex defense research and development agency under the Ministry of Defence, tasked with designing and developing cutting-edge military systems and technologies. - **Larsen & Toubro (L&T):** A leading Indian multinational engineering and construction conglomerate partnering with DRDO and the Indian Navy to manufacture and integrate critical defense equipment like AIP energy modules. **Introduction** The Indian Navy and DRDO have achieved a crucial milestone in submarine technology with the inauguration of the Setting to Work Phase-2 Activity for the indigenous Air Independent Propulsion (AIP) system. Developed by NMRL with L&T, this system enhances the underwater endurance and stealth of conventional diesel-electric submarines, bolstering India's defense self-reliance. **Core Issue and Detailed Points** - The Indian Navy and DRDO achieved a major milestone for the indigenous Air Independent Propulsion (AIP) system by inaugurating the Setting to Work Phase-2 Activity. - The AIP system is being developed by Naval Materials Research Laboratory (NMRL) with Larsen & Toubro (L&T) as the manufacturing partner. - AIP significantly enhances the submerged endurance and stealth capabilities of diesel-electric submarines by allowing them to stay underwater longer without surfacing for air. - This initiative is a critical step towards Aatmanirbhar Bharat (self-reliance) in cutting-edge naval defense technologies. **Key Statutory Bodies, Acts & Concepts** - **Air Independent Propulsion (AIP) System:** A technology that allows conventional diesel-electric submarines to operate underwater for extended periods without surfacing to recharge batteries, significantly enhancing underwater endurance and stealth. - **Naval Materials Research Laboratory (NMRL):** A premier research laboratory under DRDO specializing in advanced materials and technologies for naval applications, including the development of the indigenous fuel-cell-based AIP system. - **Defence Research and Development Organisation (DRDO):** India's apex defense research and development agency under the Ministry of Defence, tasked with designing and developing cutting-edge military systems and technologies. - **Larsen & Toubro (L&T):** A leading Indian multinational engineering and construction conglomerate partnering with DRDO and the Indian Navy to manufacture and integrate critical defense equipment like AIP energy modules.