impending retirement from service in late 2008. However this would prove not to be the case, as the three Queens met in Southampton on 22 April 2008.[] Queen Mary 2 rendezvoused with Queen Elizabeth 2 in Dubai on Saturday 21 March 2009, after the latter ship's retirement, while both ships were berthed at Port Rashid. With the withdrawal of Queen Elizabeth 2 from Cunard's fleet and its docking in Dubai, Queen Mary 2 became the only ocean liner left in active passenger service. On 3 August 2007 three men were stopped by police while escorting and piloting a replica of the first American combat submarine within of Queen Mary 2, which was docked at the cruise ship terminal in Red Hook, Brooklyn. The replica was created by New York artist Philip "Duke" Riley and two out-of-town residents, one of whom claimed to be a descendant of David Bushnell, who had invented it. The Coast Guard issued Riley a citation for having an unsafe vessel, and for violating the security zone around Queen Mary 2. On 19 October 2011, Queen Mary 2 had her registry changed to Hamilton, Bermuda, from her previous home port of Southampton, to allow the ship to host on-board weddings. This marked the first time in its 171-year history that Cunard has not had a ship registered within the UK. Bermuda is a member of the Red Ensign Group and the ship continues to fly the undefaced Red Ensign rather than the Bermuda Red Ensign. World cruises On 10 January 2007, Queen Mary 2 started her first world cruise, circumnavigating the globe in 81 days. On 20 February, she met her fleet-mate, Queen Elizabeth 2, also on her 2007 world cruise, in Sydney harbour. This is the first time two Cunard Queens had been together in Sydney since the original Queen Mary and Queen Elizabeth served as troop ships in 1941. Despite the early arrival time of 5:42 am, the Queen Mary 2s presence attracted so many viewers that the Sydney Harbour Bridge and Anzac Bridge were blocked. With 1,600 passengers leaving the ships in Sydney, Cunard estimated the stopovers injected more than $3 million into the local economy. On 10 January 2012, the ship embarked on a three-month world cruise from Southampton, travelling south and then east around Africa, a first ever circumnavigation of Australia, to Japan, then back to Southampton along the south coastline of