HMAS Protector, Australia

The gunship was built in 1884 for the South Australian government and served in several conflicts including the Boxer Rebellion, World War I and World War II. In 1943, while serving for the US Army, the ship collided with a tugboat and was abandoned, later on being moved to the Heron Island where it was deliberately sunk to act as a breakwater. Today, the ship’s iron hull is visible from Heron Island and can even be reached by foot at low tide.