<p>NATIONAL HARBOR, Md. (April 2, 2017) Dan Dozier, vice president of the Foundation for Underwater Research and Education, explains how a human-powered submarine is operated during the International Submarine Races at the 2017 Naval Stem Exposition. (U.S. Navy photo by John F. Williams/Released)170402-N-PO203-149 
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John Williams/U.S. Navy
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/usnavy/33685797071/">Dan Dozier explains how a human-powered submarine is operated during the 2017 Naval Stem Exposition.</a>