A robotic float has discovered hidden chemicals in the ocean's lowest-oxygen regions, known as Oxygen minimum zones (OMZs), which were previously thought to have been stagnant with low levels of oxygen and nitrogen. The research, conducted over three years, revealed a dynamic interplay between organic and inorganic components on the seafloor. This discovery could help scientists assess and track ocean health. The discovery was published in Communications Earth & Environment. Since 2016, an international collaboration of scientists has planted an entire fleet of autonomous robotic floats in the Northeastern Pacific Ocean. The Biogeochemical Argo mission, or BCG-Argo, sends these tiny floats roughly 6,600 feet (2,000 meters) underwater every 10 days to provide data samples of ocean temperature, salinity, oxygen, acidity, and more.