Undersea domain awareness and anti-submarine warfare are critical to India's Indian Ocean strategy. Evaluate India's preparedness.

Undersea domain awareness (UDA) means knowing what moves beneath the sea. Anti-submarine warfare (ASW) is the ability to find and neutralise hostile submarines. Together they support India's role as net security provider in the Indian Ocean Region (IOR). The October 2026 orders for indigenous Varunastra torpedoes and the GSAT-7C satellite show progress [1], but preparedness remains uneven.

Why UDA and ASW are critical

• Hidden threat: a hostile submarine can threaten sea lanes and chokepoints that carry India's trade and energy imports before it is ever detected.
• Networked response: ships, aircraft and shore centres must share data beyond line of sight, so secure satellite links are essential.

Strengths: evidence of preparedness

• Indigenous ASW weapon: Varunastra is a ship-launched anti-submarine heavy-weight torpedo designed by DRDO's NSTL and built by BDL. A ₹1,543-crore repeat order signals serial production [1].
• Combat-proven: the Navy carried out a successful combat trial on 6 June 2023 [2].
• Space backbone: GSAT-7R (CMS-03, 2025) links the Navy's ships, submarines, aircraft and maritime operations centres [3]. It replaces GSAT-7 'Rukmini' (2013) [4]. GSAT-7C will give the IAF a dedicated satellite [1].
• Self-reliance: the entire ₹4,106 crore goes to Indian PSUs (NSIL, BDL) [1], in line with the Buy (Indian-IDDM) priority of the Defence Acquisition Procedure 2020.

Gaps: where preparedness falls short

• Long gestation: Varunastra was sanctioned in 2002 at just ₹48.50 crore [5] and handed over in 2016 [6]. A large order came only in 2026, about 24 years after sanction.
• Shifting requirements: CAG found that changing Navy requirements cost about three years of redesign. It also found late design documents and delays in choosing a production agency [5].
• Partial coverage: the new order covers ship-launched torpedoes [1]. Self-reliance does not yet extend to every undersea weapon class.
• Replacement risk: Rukmini needed a successor after about 12 years [3][4]. If successor satellites come late, the fleet network loses its links.

Verdict: the building blocks of indigenous weapons and dedicated satellites exist. Speed, scale and full coverage still lag, so preparedness is improving but only moderate.

India's undersea posture is clearly moving from import dependence towards an indigenous ecosystem, though slowly. Freezing requirements early, involving production agencies from the design stage [5] and ordering satellite successors in good time would turn this capability into credible deterrence. That would advance the SAGAR vision of security and growth for all in the region.