SS Copenhagen is a wreck off Lauderdale-by-the-Sea on Florida’s Atlantic coast, where the British-built cargo steamship ran aground on the Pompano Dropoff reef on 26 May 1900 while carrying coal from Philadelphia to Havana. Efforts to unload cargo and pull her free failed, and an inquiry later blamed Captain William Jones for improper navigation and not taking soundings. Lying in shallow water, the wreck became widely accessible and was even used for target practice during the Second World War. Now protected as an underwater archaeological preserve and listed on the National Register of Historic Places, it links Atlantic trade to the dangers of Florida’s reef-lined shore.