Tallink-Silja's M/S Symphony is one of the largest ferries in the Baltic Sea, operating normally the Helsinki - Åland (Mariehamn) - Stockholm route, along with its sister ship, M/S Serenade. The ferry is essentially a cruise ship, accommodating almost 3000 passengers and 400 vehicles, as well as a promenade running through the center of the ship. M/S Symphony was built in 1991, however it has been refurbished multiple times since then.