To learn more about how BGC-Argo contributes to the observation of the elusive and fragile ocean twilight zone, check out this paper:
The oceans’ twilight zone must be studied now, before it is too late. Exploitation and degradation of the mysterious layer between the sunlit ocean surface and the abyss jeopardize fish stocks and the climate.

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Nature 580, 26-28 (2020), doi: 10.1038/d41586-020-00915-7