December 1919 and then proceeded to Liverpool for what was planned to be a quick overhaul (he was scheduled to leave on his first voyage for the new owners on 10 January 1920). Upon inspection, the ship was found to be in poor condition. During dry-docking on 6 January, it was found that the ship's rudder had a piece missing and the propellers were suffering from erosion on their leading edges. These issues were attended to while the ship was refurbished with items borrowed from the Cunard vessels Transylvania and Carmania. Due to the extent of the work that had to be carried out, Imperator remained at Liverpool until 21 February and during this time the company's annual dinner was held on board before the ship returned to service on the North Atlantic. On 2 March 1920, the ship left New York, taking nine days to reach Southampton. During the voyage, Imperator developed a severe list that was found to be caused by a faulty ash ejector. Cunard decided that the ship was in need of a major overhaul and he was withdrawn from service. Sir Arthur Rostron of the RMS Titanic passenger rescue fame and former captain of took command of Imperator in July 1920. The following year both Imperator and Aquitania were sent to Armstrong Whitworth shipyards to be converted from coal firing to oil. The ship was renamed after the English queen Berengaria of Navarre, wife of Richard the Lionheart, in February 1921. Many Cunard ships had been named for parts of the Roman Empire and had names that ended in "ia". Like several other Cunard ships, RMS Berengaria kept the "ia" ending to his name but was not named after a province of the ancient world. In September 1925, a security alert at sea was triggered when the Cunard company offices in New York received a message stating there was a bomb aboard Berengaria; the vessel was then 1,200 miles out from New York, bound for Southampton. The ship was searched although the passengers and most crew were not informed about the reason. A fire drill was held just before the supposed time of detonation, so passengers could be placed close to their lifeboat stations without arousing suspicion. The bomb threat failed to materialize. On 11 May 1932, Berengaria ran aground in the Solent. He was refloated an hour later. In May 1934, Berengaria was again