Matangi (Autonomous Surface Vessel)

Matangi is an autonomous surface vessel built by the Pune-based firm Sagar Defence Engineering. Its public significance rests on a single, well-documented event: Sagarmala Parikrama, an Indian Navy-supported coastal transit in which the vessel ran from Mumbai to Thoothukudi on India's southern tip in autonomous mode, with no crew aboard. Reporting puts the passage at roughly 850 nautical miles, or about 1,500 km, and describes the first leg — Mumbai to Karwar, around 350 nautical miles — as completed overnight. The vessel was flagged off by the Defence Minister at the Swavlamban 2024 plenary at Bharat Mandapam on 29 October 2024, and the Indian Navy's own spokesperson account announced the launch of the passage the same day. What the transit demonstrates is endurance and unsupervised decision-making over open water for days at a stretch, in some of the busiest coastal traffic on the Indian seaboard. That is a materially harder problem than a short harbour-defence sortie: it requires the vessel to hold a route, detect and avoid other traffic, and recover from degraded conditions without an operator in the loop. Reporting credits an indigenously developed navigation and collision-avoidance software stack, with later coverage attributing the capability to the firm's in-house autonomy suite. The Atlas records Matangi as a validated demonstrator rather than a fleet capability. A flag-off by a minister and a completed transit establish that the autonomy works over that distance; they do not establish an induction, a production configuration, or a signed platform order. No primary Ministry of Defence or Navy contract document for this specific platform has been located, and the relationship between the Matangi transit hull and the company's later weaponised interceptor and swarm products is not publicly resolved. Both gaps are recorded below rather than papered over.