Prince William, Duke of Cambridge during an official visit to The Royal Navy Submarine Museum on May 12, 2014 in Gosport, England.

Prince William, Duke of Cambridge during an official visit to The Royal Navy Submarine Museum on May 12, 2014 in Gosport, England.

USS Silversides WWII Submarine Museum, Muskegon, MI.

USS Silversides WWII Submarine Museum, Muskegon, MI.

Remote controlled mine clearing mini sub at the Japanese Maritime Self-Defense Force Submarine Museum | Atlas Obscura

Remote controlled mine clearing mini sub at the Japanese Maritime Self-Defense Force Submarine Museum | Atlas Obscura

Prince William, Duke of Cambridge is shown the inner workings of the Submarine HMS Alliance as he arrives at the Royal Navy Submarine Museum on May 12, 2014 in Gosport, England.

Prince William, Duke of Cambridge is shown the inner workings of the Submarine HMS Alliance as he arrives at the Royal Navy Submarine Museum on May 12, 2014 in Gosport, England.

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