On 3 July 1952, SS United States starts her maiden voyage. During her maiden voyage the United States broke the transatlantic speed record held by the RMS Queen Mary for the previous 14 years by over 10 hours, making the maiden crossing from the Ambrose lightship at New York Harbor to Bishop Rock off Cornwall, UK in 3 days, 10 hours, 40 minutes at an average speed of 35.59 knots (65.91 km/h; 40.96 mph).