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Discovering Dark Oxygen - How oxygen is produced in the deep sea

A discovery in the dark depths of the Pacific Ocean is challenging the scientific consensus of how oxygen is produced and has even called into question how life on Earth began. Photosynthetic organisms like plants and algae use energy from sunlight to create the planet’s oxygen but new evidence has shown how oxygen is also produced in complete darkness at the seafloor 4,000 metres below the ocean surface, where no light can penetrate.