From the deepest oceans to icy moons, this episode follows the detective story of 'dark oxygen'—oxygen produced without photosynthesis. We explore the geobattery idea—natural electrolysis on polymetallic nodules—plus in situ benthic chambers and lab tests that show oxygen generation in the dark. We weigh skepticism, unpack the evidence, and discuss what this could mean for life on Earth and the search for life beyond our planet.

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