Down it goes! Casting a CTD into the deep blue. Instrument technicians trigger the closure of Niskin bottles at wanted depths for the collection of sample seawater.
A CTD Cast
Image courtesy of the Mapping the Uncharted Diversity of Arctic Marine Microbes expedition. Download larger version (jpg, 2.5 MB).

Down it goes! Casting a CTD into the deep blue. Instrument technicians trigger the closure of Niskin bottles at wanted depths for the collection of sample seawater.

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