The 2000 Summer Olympic Games opened in Sydney, Australia.
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Australian swimmer Kyle Chalmers won the 100-meter freestyle gold medal in the Rio de Janeiro Olympics.
Queen Elizabeth II of England declared the 30th Olympics opened in London, UK.
Imperial Japan began a series of submarine attacks on Sydney.
Queen Elizabeth II led the Sydney Opera House's grand opening.
American swimmer Michael Phelps became the first person to win eight gold medals at one Olympic Games.
