330-PSA-16-60 (USN 1047345):   Underwater Eyes.  A U.S. Navy frogman tests sonar equipment developed to locate underwater objects.  The light-weight, portable, diver-held sonar system is economically powered by standard flash-light batteries.  Earphones provide the diver with audio information of objects detected by the searching sonar beam.   Photograph released May 5, 1960.  (8/25/2015).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
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