Deep-sea oxygen mystery discovered

Scientists have found an unusual source of oxygen production in the deep Pacific Ocean, where sunlight cannot reach. This discovery challenges long-held beliefs about how oxygen is created on Earth.

Location of the discovery

The discovery was made in the Clarion-Clipperton Zone (CCZ), a vast area between Hawaii and the coasts of Mexico. This region is known for its rich deposits of polymetallic nodules, which are small rocks containing valuable metals like nickel, manganese, and cobalt.

Oxygen without sunlight

The study found that these nodules generate oxygen through a process called "black oxygen." Unlike photosynthesis, which requires sunlight, this process involves natural electrochemical reactions within the nodules. This has surprised scientists, as it suggests oxygen can form in the absence of light.

Scientific implications

The lead researcher, Andrew Sweetman, explained that the phenomenon was first noticed in 2013 when oxygen levels were unexpectedly high. Further testing confirmed the findings. Even when the nodules were sterilized, oxygen was still produced, indicating a non-biological process.

Broader implications for life

The discovery could change how scientists understand the origins of life on Earth and beyond. Moons like Europa and Enceladus, which have subsurface oceans, might also have similar geological features that could produce oxygen, potentially supporting life.

Mining and environmental concerns

The discovery comes amid growing interest in deep-sea mining for metals used in electric vehicle batteries. However, 25 countries have called for a pause on such mining due to concerns about its environmental impact. Scientists stress the need to understand these ecosystems before exploiting them.

Future research and regulation

The International Seabed Authority is working to regulate deep-sea mining, but this study highlights the need for more research. The deep sea remains largely unexplored, and its preservation may be as important as its resources.