INDIA AND SRI LANKA DEEPEN MARITIME COOPERATION THROUGH IN–SLN DIVEX 2026

1. At a Glance

• IN–SLN DIVEX is a bilateral diving exercise between the Indian Navy (IN) and Sri Lanka Navy (SLN) focused on specialised underwater operations and submarine rescue interoperability [S1].
• The 4th edition (DIVEX 2026) was held at Colombo from 21–28 April 2026, featuring INS Nireekshak, a Diving Support and Submarine Rescue Vessel [S1][S2].
• Relevant for GS-II (India–Neighbourhood, IOR diplomacy) and GS-III (Maritime security, defence exercises).

2. Why in the News

• PIB release dated 29 April 2026 announced conclusion of the 4th IN–SLN DIVEX, signalling deepening maritime cooperation in the Indian Ocean Region (IOR) [S1].
• Builds on SLINEX-25 concluded at Colombo on 18 August 2025 (12th edition) [S3].

3. Background & Evolution

• SLINEX (Sri Lanka–India Exercise) — flagship annual bilateral naval exercise conceptualised in 2005 [S3].
• IN–SLN DIVEX is a separate, specialised diving-focused engagement; 2026 marks the 4th edition [S1].
• Earlier joint dive engagements: INS Nireekshak deployed to Trincomalee in 2023 for joint dive training [S2].
• Sits within India's SAGAR (Security and Growth for All in the Region) framework and broader Neighbourhood First policy.

4. Core Static Facts

• Exercise name: IN–SLN DIVEX 2026 (4th edition) [S1].
• Dates: 21–28 April 2026 [S1].
• Venue: Colombo, Sri Lanka [S1].
• Indian asset: INS Nireekshak — Diving Support and Submarine Rescue Vessel, built by Mazagon Dock Shipbuilders, commissioned 1989 (operationally inducted; reported 1995) [S2].
• Drills: Advanced deep-sea diving evolutions, mixed gas diving, harbour and open-sea dives [S1].
• Parent ministry: Ministry of Defence, Government of India; executing service: Indian Navy [S1].
• Allied bilateral exercise: SLINEX — last edition SLINEX-25 (12th), Colombo, 14–18 Aug 2025 [S3].
• SLINEX-24: Visakhapatnam, 17–20 Dec 2024, under Eastern Naval Command [S3].

5. Multi-Dimensional Analysis

Geopolitical / Strategic - Reinforces India's primacy as first responder and preferred security partner in the IOR, countering extra-regional naval presence (notably Chinese PLAN port calls at Hambantota/Colombo) [S1]. - Submarine rescue interoperability is a niche capability; demonstrating it deepens India's role as a net security provider under SAGAR [S1].

Administrative / Defence - Distinct exercise streams: SLINEX (surface, gunnery, VBSS) vs DIVEX (sub-surface, diving, salvage) — illustrates compartmentalised but complementary engagement architecture [S1][S3].

Scientific / Technological - Mixed-gas diving (heliox/trimix) is critical for deep-sea salvage and submarine escape & rescue (SMER) beyond air-diving limits (~50 m) [S1]. - Aligns with capability build-up via INS Nistar, the first indigenously designed Diving Support Vessel, commissioned 2025 at Visakhapatnam [S2].

Historical - India–Sri Lanka maritime engagement evolved from post-LTTE confidence-building to structured interoperability drills since 2005 [S3].

6. Recent Developments (last 12–18 months)

• Apr 2026: IN–SLN DIVEX 2026 (4th edition) concluded at Colombo [S1].
• 21 Apr 2026: INS Nireekshak arrived Colombo for DIVEX [S2].
• Aug 2025: SLINEX-25 (12th edition) concluded at Colombo [S3].
• Dec 2024: SLINEX-24 held at Visakhapatnam [S3].
• 2025: Commissioning of INS Nistar, India's first indigenous Diving Support Vessel [S2].

7. Prelims Hooks

• IN–SLN DIVEX 2026 was the 4th edition of the exercise [S1].
• Venue of DIVEX 2026: Colombo (not Trincomalee or Visakhapatnam) [S1].
• Dates: 21–28 April 2026 [S1].
• Participating Indian vessel: INS Nireekshak — a Diving Support and Submarine Rescue Vessel [S1][S2].
• INS Nireekshak built by Mazagon Dock Shipbuilders Ltd, Mumbai [S2].
• Key drill featured: Mixed gas diving [S1].
• SLINEX was conceptualised in 2005 [S3].
• SLINEX-25 was the 12th edition, held at Colombo in August 2025 [S3].
• SLINEX-24 was hosted at Visakhapatnam under the Eastern Naval Command [S3].
• India's first indigenous Diving Support Vessel is INS Nistar, commissioned at Visakhapatnam [S2].
• Implementing ministry: Ministry of Defence (not MEA) [S1].
• India's IOR doctrine framing: SAGAR (2015 vintage).

8. Mains Relevance

• GS-II: India and its neighbourhood relations — India–Sri Lanka bilateral ties.
• GS-III: Security challenges and their management in border areas; various security forces and agencies and their mandate.
• Probable stems: 1. "Bilateral naval exercises have become the principal vehicle of India's maritime diplomacy in the Indian Ocean Region." Discuss with reference to India–Sri Lanka cooperation. 2. "India's submarine rescue and diving capability is emerging as a strategic instrument of regional security." Examine. 3. Evaluate the relevance of SAGAR doctrine in shaping India's engagement with Indian Ocean littoral states.

9. Related Topics to Study Next

• SLINEX — sister surface exercise, frequently paired in MCQs.
• SAGAR / MAHASAGAR doctrine — overarching IOR vision.
• Colombo Security Conclave (CSC) — India–Sri Lanka–Maldives–Mauritius minilateral.
• INS Nistar & INS Nipun — indigenous Diving Support Vessels (Atmanirbhar Bharat in defence).
• Deep Submergence Rescue Vehicle (DSRV) programme of Indian Navy.
• MILAN, MALABAR, TROPEX — to contrast multilateral vs bilateral exercises.
• Hambantota port lease — strategic backdrop to India's outreach.
• IORA & IONS — institutional maritime architecture.

10. Common Errors / Trap Areas

• Confusing DIVEX with SLINEX — DIVEX is diving-specific; SLINEX is broader maritime.
• Misattributing INS Nireekshak as a submarine — it is a surface Diving Support Vessel.
• Confusing INS Nireekshak (1989, MDL) with INS Nistar (2025, indigenous DSV).
• Naming the wrong ministry — exercise is under MoD/Indian Navy, not MEA.
• Mixing up venue: DIVEX 2026 was at Colombo, while earlier joint dive training was at Trincomalee (2023).

11. Sources

• [S1] INDIA AND SRI LANKA DEEPEN MARITIME COOPERATION THROUGH IN–SLN DIVEX 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2256710 — (tier 1)
• [S2] INS Nireekshak Arrives at Colombo for IN–SLN DIVEX 2026 / INS Nistar commissioning — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2254416 ; https://www.pib.gov.in/PressReleasePage.aspx?PRID=2145766 — (tier 1)
• [S3] SLINEX-25 conclusion & SLINEX-24 release — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2159316 ; https://www.pib.gov.in/PressReleasePage.aspx?PRID=2088114 — (tier 1)