Scientists Uncover 'Dark Oxygen' Forming Deep in the Ocean Without Sunlight

Scientists have discovered a new way oxygen is produced deep in the ocean without sunlight. This finding challenges long-held beliefs about how oxygen forms in nature. The process, called chemolithoautotrophy, involves chemical reactions with metals like manganese in deep-sea sediments. The discovery happened during research on deep-sea sediments near metal deposits. Unlike photosynthesis, this oxygen production does not rely on light. Instead, it works similarly to fuel cells, suggesting potential for new energy sources.

The phenomenon, named dark oxygen, may support unique deep-sea organisms adapted to extreme conditions. It also opens doors to further study of other deep-sea regions and possible applications in energy and climate science. Understanding dark oxygen could refine climate models by improving knowledge of oceanic oxygen cycles. It also highlights the need to protect deep-sea habitats for conservation. The discovery marks another major step forward in exploring the ocean’s hidden processes.