India’s Defence Research and Development Organisation (DRDO) is charting a bold new course in undersea warfare by developing submarine-launched Unmanned Launchable Underwater Aerial Vehicles (ULUAVs) and autonomous underwater drone swarms. This pioneering initiative, in collaboration with Sagar Defence Engineering, marks a significant leap in India’s quest for technological superiority and indigenous innovation in naval operations.
ULUAVs are hybrid drones that can be launched from a submarine’s torpedo tube, travel underwater, then surface and transition into flight mode. This unique capability allows submarines to deploy aerial drones while remaining submerged and undetected, vastly expanding their intelligence, surveillance, and reconnaissance (ISR) reach without compromising stealth.
ULUAVs are designed to be deployed from torpedo tubes even as the submarine is underway. Indian ULUAVs are targeting over one hour of endurance and 20+ km range, surpassing current U.S. equivalents that typically offer 30 minutes and 7 km.
Once launched, the ULUAV autonomously surfaces and takes flight, conducting ISR missions, acting as a radio relay, or potentially carrying out electronic warfare and decoy operations. The system is engineered for reliable post-mission recovery, essential for repeated operational use.
Alongside ULUAVs, DRDO is advancing autonomous underwater drone swarms—groups of small unmanned underwater vehicles (UUVs) that can be deployed and coordinated from a submarine.
Submarines can now monitor surface threats, relay communications, and even target adversaries without surfacing, maintaining their stealth advantage. These unmanned systems dramatically expand the submarine’s operational envelope, providing over-the-horizon ISR and targeting data for coordinated naval and air operations.
AI-driven swarms and versatile ULUAVs enable a single submarine to perform multiple simultaneous missions, from reconnaissance to electronic warfare, and potentially kinetic strikes in the future.
The ULUAV contract was awarded to Pune-based Sagar Defence Engineering, chosen from 17 Indian firms under DRDO’s Technology Development Fund. This reflects a strategic shift toward leveraging private sector innovation and building a robust indigenous defence ecosystem.