India’s High Endurance Autonomous Underwater Vehicle will equip its navy with more surveillance capabilities India announced on Monday the successful testing of its High Endurance Autonomous Underwater Vehicle (HEAUV), developed by the Naval Science and Technological Laboratory (NSTL). The NTSL is a defense research laboratory based in Visakhapatnam on the southeastern coast of India. The HEAUV underwent trials in a lake, demonstrating its capabilities in both surface and submerged conditions