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Diver attaching an instrument housing to the seafloor

By Coastal and Marine Hazards and Resources Program 2010 (approx.)
SCUBA diver underwater holds sampling gear.
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Detailed Description

Don Hickey attaches a PVC (polyvinyl chloride) housing to the seafloor. The instrument in the housing collects conductivity (related to salinity) and temperature data at a site in Dry Tortugas National Park where researchers are studying coral calcification.

Sources/Usage

Public Domain.