Before a dive, WHOI engineer Rod Catanach prepares Sentry's high-tech “nose”—an underwater mass spectrometer developed by WHOI scientist Rich Camilli that can detect and identify minute quantities of chemicals in seawater. The instrument, called TETHYS, is in the cylindrical gray metal housing with the multiple rows of band clamps around it. (Rich Camilli, Woods Hole Oceanographic Institution)[back]
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