National Oceanic and
Atmospheric Administration
United States Department of Commerce


PMEL Full Ocean Depth Hydrophone deployed during the 2020 Caladan Oceanic expedition in the Mariana Trench

PMEL Acoustics Program and Engineering Development Division participated as part of a memorandum of understanding between NOAA and Caladan providing subject matter expertise on pressure sensors and acoustics during the June mission in the Mariana Trench to map the Challenger Deep with pressure sensors and collect oceanographic data.

CLOSP lander on the deck of the DSSV Pressure Drop that houses scientific sensors. It is approximately 1 by 1.5 by 1.8 meters in size

The full-ocean depth hydrophone (top left) attached to the CLOSP lander along with a conductivity, temperature and depth sensor (CTD). The lander also stores geological and biological samples collected by the submersible. Photo Credit: Kathy Sullivan/Caladan Oceanic


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