The CTD instrument package is lifted off the deck of the ship before it is lowered over the side on a cable to collect water samples and look for hydrothermal plumes.

The CTD instrument package is lifted off the deck of the ship before it is lowered over the side on a cable to collect water samples and look for hydrothermal plumes. Image courtesy of Submarine Ring of Fire 2014 - Ironman, NSF/NOAA.

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Submarine Ring of Fire 2014 - Ironman: Mission Logs

Submarine Ring of Fire 2014 - Ironman