Oxygen is being produced in total darkness without any sunlight
In short: For decades, we assumed photosynthesis was the only way to generate oxygen on a large scale. But deep beneath the ocean's surface, life is thriving in the pitch black. This discovery of "dark oxygen" challenges our understanding of biology and provides a new lens for finding extraterrestrial life.
In 2024, researchers discovered that potato-sized metallic nodules on the seafloor of the Pacific and Indian oceans—specifically within the Clarion-Clipperton Zone—are producing oxygen. This was a startling find because it contradicts the long-held scientific consensus that large-scale oxygen production requires sunlight and photosynthesis. Instead, these nodules appear to generate "dark oxygen" in environments thousands of meters deep, supporting diverse animal communities including microbes, sea cucumbers, and carnivorous anemones.
The proposed mechanism for this phenomenon is electrolysis. Scientists hypothesize that the layers of metals within the nodules generate an electric current capable of breaking down seawater into hydrogen and oxygen. Measurements have shown voltages of up to 0.95 volts on the surface of these nodules—slightly less than a standard AA battery. While 1.23 volts is typically required for electrolysis, researchers believe that individual nodules or clusters may combine to reach the necessary threshold.
This discovery has significant implications for the Fermi Paradox and the search for biosignatures. Currently, identifying alien life is difficult because many gases produced by biology, such as methane and sulfur dioxide, can also be created by non-living geological processes like volcanoes. By identifying oxygen as a gas that can appear in places where it "shouldn't" be—independent of photosynthesis—scientists may have found a new way to pinpoint out-of-place biological activity on other planets.
The find has sparked intense controversy regarding deep-sea mining. Companies looking to smelt these nodules for cobalt, nickel, and manganese have disputed the findings. To provide more evidence, researchers from the Scottish Association for Marine Science are planning expeditions to depths of 10,000 meters to measure oxygen fluxes, pH levels (to check for acidity increases caused by electrolysis), and sediment cores to see if microscopic organisms are involved.
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Sources
- Summary by Intellect · source: Why The Discovery Of Dark Oxygen Gives Us A New Solution To The Fermi Paradox
- Also: Scientists investigate ‘dark oxygen’ in deep-sea mining zone | New Scientist
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