The Mysterious Discovery of ‘Dark Oxygen’ on the Ocean Floor

<p>Researchers believe they have discovered oxygen being produced 4,000 meters below the sea surface, and think polymetallic nodules—the sought-after bounty of deep-sea miners—could be the source.</p><p> </p> Learn about your ad choices: <a href="https://dovetail.prx.org/ad-choices">dovetail.prx.org/ad-choices</a>