Summary:

- The article discusses a recent scientific claim that large areas of the seafloor are devoid of oxygen, which was met with skepticism from other researchers.
- The original claim, published in the journal Nature Geoscience, suggested that up to 8 million square kilometers of the seafloor may be "dark ocean" with extremely low oxygen levels, posing a threat to marine life.
- However, other scientists have raised concerns about the methodology and data used in the original study, arguing that the evidence for such widespread deoxygenation of the seafloor is not yet conclusive, and more research is needed to fully understand the extent and implications of this phenomenon.