Deep Ocean Mission

India has an 11,098-km coastline and a vast ocean territory, but for decades explored little of its depths. The Deep Ocean Mission was approved in 2021 with an outlay of about Rs 4,077 crore over five years, run by the Ministry of Earth Sciences. Its boldest goal: send Indians to the deep-sea floor in an indigenous submersible.

The mission's flagship is Matsya-6000 (Sanskrit for 'fish'), a crewed submersible being developed by NIOT Chennai to carry three aquanauts to 6,000 metres inside a titanium-alloy sphere; it completed harbour wet tests in early 2025. In August 2025, two Indian aquanauts dived to 4,025 m and 5,002 m aboard the French submersible Nautile — a key step toward Matsya-6000's own deep dive, targeted by 2027 as of August 2025. Its first 500 m shallow-water dive was scheduled for the last quarter of 2026.

The titanium personnel sphere protects the crew from crushing pressure — it is designed to withstand 600 bar, about 600 times the pressure at the surface. The submersible carries life support for 12 hours (96 in emergencies), plus sensors, samplers and robotic arms to study the seabed. Sister projects map polymetallic nodules, ocean climate and deep-sea biodiversity.

The deep sea is the next resource and science frontier. India holds exploration rights over large areas of the Central Indian Ocean for polymetallic nodules — cobalt-rich rock lumps; the mission has collected over 100 kg of them from 1,173 m depth. With Matsya-6000, India would become the sixth nation to have developed its own deep-ocean crewed submersible.

Rs 4,077 crore mission outlay (2021). Matsya-6000 submersible — 3 aquanauts, 6,000 m depth target. 5,002 m reached by an Indian aquanaut aboard the French submersible Nautile (August 2025). 2027 target for the full crewed 6-km dive (as of August 2025); first 500 m Matsya-6000 dive scheduled for late 2026. Sources: Ministry of Earth Sciences, NIOT, PIB.