A July 2024 Nature Geoscience paper reported oxygen increases in experiments at a deep, nodule-covered seafloor and proposed a possible electrochemical contribution. On 8 April 2026, the editors alerted readers that aspects of the paper were subject to concerns still being considered. The reported observation and proposed mechanism must be treated as contested, not established evidence that nodules are natural oxygen-producing batteries.
The paper attracted attention because deep-seafloor experiments are normally used to measure oxygen consumption, yet the authors reported increases in darkness. Their laboratory observations associated the effect with polymetallic nodules, and measured surface potentials informed a hypothesis involving seawater electrolysis. Those are several evidentiary steps: an instrument reading, exclusion of alternative explanations, a repeatable phenomenon and a mechanism. A striking reading does not automatically establish all four, particularly when the mechanism is proposed rather than directly demonstrated.
The live article now carries an editor’s note dated 8 April 2026: concerns about aspects of the paper are under consideration, and a further editorial response is promised after resolution. The notice does not itself state that the paper has been retracted or specify a completed verdict. It does mean that a website should stop short of presenting the finding as settled. Independent replication, transparent calibration and rigorous controls are the path from a provocative report to reliable knowledge.
The established record.
- 01
The original paper was published on 22 July 2024.
- 02
Seawater electrolysis was proposed as a possible contribution, not established as the mechanism.
- 03
An 8 April 2026 editor’s note states that concerns are being considered.
How the story unfolded.
- 2021–2022
Seafloor chamber experiments
Experiments later described in the paper measure oxygen at the nodule-covered seafloor.
- 22 July 2024
An unusual result is published
The authors report oxygen increases and propose a possible electrochemical explanation.
- 8 April 2026
Readers are alerted
Nature Geoscience posts an editor’s note about concerns awaiting resolution.
Where the evidence stops.
The editorial concerns remain unresolved in the checked record. Do not present oxygen production or the electrolysis mechanism as settled, and do not label the paper retracted when the notice does not say that.
What would move this forward?
- Replicate the experiments independently with pre-specified protocols and complete calibration data.
- Use controls capable of excluding contamination, chamber effects and measurement artefacts.
- Demonstrate the proposed electrochemical pathway and oxygen production under relevant conditions.
Read the original sources.
The source may establish a narrower point than the headline. Follow the specific finding, its date and its limitations.
Which measurements would show that the oxygen increase is real, and which would identify its source?