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On 27 July 1866, the first successful transatlantic cable, stretching from Valentia, Ireland, landed in Heart's Content, Newfoundland. Tested with the message, "All right," it began public operations the next day, forever altering transoceanic commerce, politics and personal relations. This built upon the first successful undersea telegraph cable, between Dover and Calais, which went into public service on 13 November 1851.