was at , while submerged range was at . There is significant variation in references as to the vessel's horsepower and speed, for example the Register of Ships of the U. S. Navy gives horsepower figures of surfaced and submerged, with surfaced and submerged. Service Holland VI eventually proved her validity and worthiness as a warship and was ultimately purchased by the U.S. government for the sum of $150,000 on 11 April 1900. She was considered to be the first truly successful craft of her type. The United States Government soon ordered more submarines from Holland's company, which were to be known as the . These became America's first fleet of underwater naval vessels. Holland VI was modified after her christening, and was renamed United States Submarine Torpedo Boat Holland (Submarine-1) when she was commissioned by the US Navy on 12 October 1900, at Newport, Rhode Island, with Lieutenant Harry H. Caldwell in command. During her commissioned life in the USN, the Holland did not carry the hull designation SS-1. The designation system currently in use was placed into Naval Regulations on 17 July 1920. Thus, the Holland would have never been assigned SS-1. She would have been designated Submarine-1 or simply S-1 under the system in place between 1895 and 1920. Most historians, including official Navy sources, have retroactively applied both the prefix USS and the designation SS-1 to avoid confusion. Holland was the first commissioned submarine in the US Navy and is the first of the unbroken line of submarines in the Navy. She was the fourth submarine to be owned by the Navy, however. The first submarine was Propeller (also known as Alligator), the second was Intelligent Whale and the third was Plunger, an experimental submarine, built in 1895, which is not to be confused with USS Plunger (SS-2). On 16 October 1900, in order to be kept serviceable throughout the winter, Holland left Newport under tow of the tug Leyden for Annapolis, Maryland, where she was used to train midshipmen of the United States Naval Academy, as well as officers and enlisted men ordered there to receive training vital in preparing for the operation of other submarines being built for the Fleet. Holland proved valuable for experimental purposes in collecting data for submarines under construction or contemplation. Her surface run, from Annapolis to Norfolk, Virginia from 8–10 January 1901, provided useful data on her performance underway