Summary:
- Scientists have discovered a new type of "dark oxygen" in the deep ocean, which challenges our understanding of how oxygen is distributed in the ocean.
- This dark oxygen is found in oxygen-depleted regions of the ocean, where it is produced by certain microbes that can use alternative electron acceptors instead of oxygen.
- The discovery of this dark oxygen could have important implications for our understanding of global biogeochemical cycles and the role of the ocean in regulating atmospheric oxygen levels.