Between 2014 and 2017, underwater robots found surface chlorophyll 1,000 metres deep; scientists have now explained how it arrived

Scientists have solved the mystery of unusually high concentrations of chlorophyll detected more than 1,000 metres beneath the ocean surface by autonomous underwater robots after years of puzzling. The discovery, which took place between 2014 and 2017 in the North Atlantic, defied existing knowledge, as chlorophyll, produced by microscopic algae that rely on sunlight, is generally found in the upper layers of the ocean.

Raccontata datimesofindia.indiatimes.com