MS Fennia, built in 1966, was a significant Finnish car-passenger ferry notable for her large size and varied service history. Constructed during Finland's early foray into genuine car-ferry traffic between Finland and Sweden, she was delivered by Öresundsvarvet in Landskrona, Sweden, and christened Fennia. At the time, she was the largest ferry operating between Finland and Sweden. Her physical configuration included a terraced rear superstructure, which was later modified, and two funnels, with her appearance evolving over her lifetime. Fennia's service record was extensive, marked by her role as a flagship in the Finland–Sweden route. She initially operated for Siljavarustamo / Siljarederiet and was part of the pioneering fleet of Finnish car ferries. Early in her career, she faced a grounding near Bogskär in October 1966, requiring repairs at Stockholm. Throughout the late 1960s and early 1970s, she switched ownership to Svea Line, later rebranded as Silja Line, and was involved in various incidents, including collisions and engine room accidents. Her routes included Turku–Stockholm, Helsinki–Stockholm, and later routes across the Kvarken region, such as Vaasa–Umeå and Jakobstad–Skellefteå. In the 1980s and 1990s, Fennia was repeatedly chartered and sold among Finnish, Swedish, and international operators, including Jakob Lines, Vaasanlaivat/Vasabåtarna, and SeaWind Line. Her design was modified in 1985-1986, with added cabins and a sleeker funnel design, reflecting her adaptation to different routes and operational needs. She also served on Irish routes with B&I Line briefly. In 2001, she was sold to RG Line and renamed Casino Express, later C. Express, and finally Onyx. Her later years involved extensive lay-ups, hazardous material concerns, and salvage operations. In 2010, after a series of mechanical issues and a storm-damaged grounding, she was sold for scrap and beached at Gadani Beach, Pakistan. Throughout her career, Fennia was a representative vessel of the evolution of Finnish and regional ferry services, reflecting changes in maritime technology, route demands, and environmental considerations.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.