The TETHYS mass spectrometer aboard Sentry detected chemicals clues of a cold seep and the robot requested permission to change course and see if a cold seep was actually there. Sentry turned out to be right. It homed in on a site where UCSB scientist Dave Valentine, diving in the submersible Alvin, had found a cold seep and left a marker with his name on it (upper left) in 2007. (Courtesy of Dave Valentine, University of California, Santa Barbara)[back]
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