170402-N-PO203-114 NATIONAL HARBOR, Md. (Apr. 2, 2017) Darby McCoy, 11, tries out a human-powered submarine as her sister, Jae, 8, and friend Aria Raphael, 9, and her sister Nora, 7, watch, during the 2017 Naval Stem Exposition, co-sponsored by the Navy League of the United States and the Office of Naval Research (ONR). The event offers hands-on activities and provides an introduction to naval STEM careers and educational opportunities including information about the 2017 International Submarine Races. ( Navy photo by John F. Williams/Released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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