Ocean science and the Deep Ocean Mission

Oceans cover most of the earth's surface, regulate climate by absorbing heat and carbon dioxide, and support fisheries, shipping and coastal livelihoods. Yet the deep ocean, below sunlight, remains less mapped than the surface of the Moon, and India, with a long coastline and island territories, has both scientific and economic reasons to study it: monsoon forecasting, marine resources, coastal safety and the health of coral and fishery ecosystems.

The Deep Ocean Mission was approved by the Union Cabinet in 2021, with an outlay of about 4,077 crore rupees over five years, to build India's capacity in deep-sea exploration and technology. Its best-known element is Samudrayaan, a crewed submersible called Matsya 6000, designed to carry people to a depth of 6,000 metres. Alongside it, the mission covers deep-sea mining technology, ocean climate services, marine biodiversity and the development of ocean energy and desalination technologies.

The mission is run by the Ministry of Earth Sciences, which also operates weather, monsoon and ocean observation networks. That institutional link matters: deep-ocean research is not separate from everyday forecasting, because ocean temperatures and currents shape the monsoon, cyclones and coastal flooding. Instruments on ships, buoys and satellites feed models that farmers, fishers and disaster managers use, so investment in ocean observation has practical returns well before any mineral is recovered.

Deep-sea mining is the most contested element. Polymetallic nodules on the seabed contain nickel, cobalt, copper and manganese, and India holds exploration rights in the central Indian Ocean through the International Seabed Authority. Supporters argue that seabed minerals could reduce import dependence; critics warn that mining could damage fragile deep-sea ecosystems that are poorly understood and slow to recover, and that the rules for sharing benefits from international waters are still evolving.

The balanced assessment is that ocean science is valuable even if seabed mining never becomes commercial. Better monsoon and cyclone forecasts, fishery advice, tsunami warning and coastal planning are certain public goods, while mineral extraction remains a conditional prospect that must pass environmental and economic tests.