The CTD/Niskin rosette cast arrives back on deck full of water samples. Each Niskin bottle on the rosette is remotely triggered to collect water samples at various depths. Water collected from a hydrothermal vent plume are sampled back on board to determine the type of hydrothermal vent the plume came from. Image courtesy of UCSB, Univ. S. Carolina, NOAA, WHOI.
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