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India's 5,000-meter Nautile rehearsal pressure-tests life support, comms, and retrieval—putting a safe, crewed 6,000-meter Matsya within reach, and responsibly unlocking ISA-licensed critical minerals.
The Business Guardian
|August 23, 2025
India's deep-ocean program has accelerated in the 2020s under the Deep Ocean Mission (DOM), aiming to deploy an indigenous crewed submersible Matsya-6000 capable of 6,000 m depths.
Key milestones include the recent event of India's first manned 5,000 m dives (using the French Nautile sub) in August 2025, and extensive wet trials of Matsya-6000 itself in 2024-2025.
These developments parallel global history (e.g., bathyscaphe Trieste, Jiaolong, Alvin, Mir) and set the stage for India joining the handful of nations with deep-crewed submersibles.
NAUTILE EXPEDITION TO MATSYA-6000
•2021: Union Cabinet approves the Deep Ocean Mission (aka Samudrayaan), encompassing manned and unmanned submersibles, underwater vehicles and deep-sea mining R&D.
This marked formal commitment to develop an Indian deep-diving capability.
•2022-2024: NIOT (National Institute of Ocean Technology) completes design of Matsya-6000 (3-person titanium sphere) and builds subsystems under MoES (Ministry of Earth Sciences).
Early dry dock tests validate life-support, ballast, thrusters and communications hardware.
In late 2024, Matsya-6000 completed integrated dry tests simulating 500 m depths, then moved to L&T Shipbuilding (Kattupalli) for wet trials.
In Jan-Feb 2025 eight shallow-water dives (five unmanned, five manned) were performed to qualify life-support, control systems and sensor payloads.
•Feb 2025: PIB press release confirms Matsya-6000 wet-test success.
Crucially, the tests included manned dives to verify life-support reliability under pressure and communications/telemetry, though limited by shallow depth.
This paves the way for a planned 500 m manned dive by end-2025.
The 2.1 m sphere (to be upgraded to 80 mm titanium) is being engineered for 96 h emergency endurance and multi-node acoustic comms.
•Aug 2025: Two NIOT aquanauts (Raju Ramesh and Cdr. J.P. Singh) join a French cruise off Portugal and ride Nautile to 4,025 m and 5,002 m depths in early August.
Dit verhaal komt uit de August 23, 2025-editie van The Business Guardian.
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