3478896 The laying of the Atlantic telegraph cable, 1858; (add.info.: Cartoon from Punch, 1858, at the time of the laying of the Atlantic telegraph cable. A transatlantic telegraph cable is an undersea cable running under the Atlantic Ocean used for telegraph communications. The first was laid across the floor of the Atlantic from Telegraph Field, Foilhommerum Bay, Valentia Island in western Ireland to Heart\'s Content in eastern Newfoundland. The first communications occurred August 16, 1858.); Universal History Archive/UIG; out of copyright.