HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart after a visit to the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Samir Hussein/WireImage)
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WireImage Samir Hussein

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are shown a core sample from under the sea while visiting the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Chris Jackson - Pool/Getty Images)
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Chris Jackson Collection Chris Jackson

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are shown a shipping container simulator as they visit the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Samir Hussein/WireImage)
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WireImage Samir Hussein

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge are shown a lego ship as they visit the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Chris Jackson - Pool/Getty Images)
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Chris Jackson Collection Chris Jackson

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Maritime Museum to celebrate the joint UK-German year of science, which for 2017 is focused on oceans, during an official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Samir Hussein/WireImage)
Getty Images

WireImage Samir Hussein