In 2008, after some eleven years in operation as Mercury, she was renamed Celebrity Mercury. In 2011, she was transferred to the fleet of TUI Cruises, a joint venture between TUI AG and Celebrity Cruises' owner Royal Caribbean Cruises Ltd. At the same time, she was renamed Mein Schiff 2. Her sister ship Mein Schiff 1 is the former MV Galaxy, also previously operated by Celebrity Cruises.
As former Celebrity Mercury in 2006 docked in Seattle being inspected
In the summer of 2006, just prior to Mercury's planned departure for an Alaska cruise, Seattle-based inspectors from the U.S. Coast Guard arrested the captain of the Mercury for intoxication. Celebrity Cruises arranged for a replacement, and fired the original captain.
Mercury departing from Cabo San Lucas in 2005
During several cruises from Charleston, South Carolina to the eastern Caribbean in February 2010, the ship was struck with a major outbreak of norovirus, sickening nearly 500 people on board, out of a total of just over 1,800. According to Celebrity Cruises, those sickened were treated with over-the-counter medicine. Additionally, a doctor and two nurses joined the ship midway to assist with the outbreak.
In February 2011 Celebrity Mercury left Celebrity Cruises to be renovated by Imtech and join TUI Cruises' fleet as Mein Schiff 2, alongside Mein Schiff 1, her sister ship, the former Celebrity Galaxy. In May 2015, TUI Group announced that as part of their modernization strategy, TUI Cruises' Mein Schiff 1 and Mein Schiff 2 would be transferred to Thomson Cruises over the next few years.