In a major strategic step to bolster Indo-Pacific security and naval interoperability on October 23, 2026, the Indian Navy and the Republic of Singapore Navy (RSN) officially commenced the 33rd edition of the Singapore-India Maritime Bilateral Exercise (SIMBEX-2026) off the coast of Visakhapatnam, Andhra Pradesh. The high-profile bilateral exercise features advanced anti-submarine warfare drills, surface firing maneuvers, tactical air defense scenarios, and joint maritime patrol operations involving guided-missile frigates, corvettes, long-range maritime reconnaissance aircraft, and integral naval helicopters from both sovereign nations. Defense ministry representatives highlighted that SIMBEX remains one of India's longest-running continuous bilateral maritime engagements, playing a pivotal role in maintaining open, safe, and resilient sea lines of communication across the Bay of Bengal and broader Southeast Asian maritime corridors. Naval commanders and defense analysts commended the smooth execution of joint tactical planning sessions during the harbor phase, observing that the annual naval engagement reinforces mutual operational trust, advances joint maritime domain awareness, and elevates bilateral security partnerships to meet evolving regional defense priorities.

under the operational banner of the Eastern Naval Command. under the operational banner of the Eastern Naval Command.

Bilateral Maritime Drill Opens with Focus on Indo-Pacific Defense Engagement

The Indian Navy and the Republic of Singapore Navy (RSN) officially inaugurated the 33rd edition of the Singapore–India Maritime Bilateral Exercise (SIMBEX-2026) in Visakhapatnam, under the operational banner of the Eastern Naval Command.

The opening ceremony was held onboard Indian Navy stealth frigates INS Nilgiri and INS Kamorta, attended by senior staff officers from the Eastern Naval Command and the Fleet Commander of the Republic of Singapore Navy. The arrival of the RSN stealth frigate RSS Supreme at Visakhapatnam marked the formal operational commencement of the week-long exercise, which runs through October 26.

Overview: Key Operational Parameters of SIMBEX-2026

Exercise ParameterOfficial Details & Specifications
Exercise Name & EditionSIMBEX-2026 (33rd Edition)
Participating ForcesIndian Navy & Republic of Singapore Navy (RSN)
Exercise DatesOctober 21 – October 26, 2026
Harbour Phase VenueVisakhapatnam (October 21–23)
Sea Phase VenueBay of Bengal (October 24–26)
Participating AssetsRSS Supreme (RSN), INS Nilgiri, INS Kamorta (Indian Navy)
Historical PrecedentStarted in 1994 (Originally 'Exercise Lion King')

Two-Phase Structure: Harbour Interactions and Bay of Bengal Sea Drills

SIMBEX-2026 is structured into two comprehensive operational phases designed to test high-intensity maritime tactical capabilities and inter-force interoperability:

SIMBEX-2026 Operational Execution Pipeline: -------------------------------------------- Harbour Phase (Oct 21-23) ──> SME Exchanges & Joint Planning ──> Sea Phase Transition (Oct 24) ──> ASW, Anti-Air & Tactical Drills ──> Debrief & Conclusion (Oct 26)

  1. Harbour Phase (Visakhapatnam, Oct 21–23): Focuses on operational planning conferences, Subject Matter Expert Exchanges (SMEEs), cross-deck ship visits, and sporting engagements aimed at cementing professional ties and shared doctrine.

  2. Sea Phase (Bay of Bengal, Oct 24–26): Involves advanced tactical maneuvers, live firing exercises, Anti-Submarine Warfare (ASW) drills, surface strikes, and anti-air defence simulations designed to refine joint combat readiness.

"SIMBEX represents the longest continuous bilateral naval engagement that the Indian Navy maintains with any partner nation. Over three decades of uninterrupted operations have built an exceptional foundation of mutual trust and seamless tactical integration." — Eastern Naval Command Spokesperson

Strategic Convergence and Long-Standing Naval Ties

Initially launched in 1994 under the codename Exercise Lion King, SIMBEX has grown from basic anti-submarine training into a multi-domain naval warfare exercise.

The 33rd iteration underlines the deep security partnership between India and Singapore under India's 'Act East' policy and broader regional frameworks aimed at keeping sea lines of communication (SLOCs) open, safe, and resilient against evolving maritime challenges across the Indian Ocean region.