MS Kaptain Boris was a car-passenger ferry built in 1966 as Fennia for Siljavarustamo / Siljarederiet. During her long career Fennia also sailed for Jakob Lines and Vaasanlaivat / Vasabåtarna, and spent short times chartered to Sessan Linjen, SAGA Linjen, B&I Line, Baltic Line and SeaWind Line. In 2001 the ship was sold to RG Line and renamed Casino Express.
In 2007, after being laid up since 2005, the ship was sold to Attar Construction Ltd and renamed C. Express. Concerned about the hazardous materials inside the ship, the Finnish Environment Institute issued a transport ban on the vessel to prevent her from being moved for scrapping in inappropriate conditions. The ban was lifted in July 2009 and the ship, renamed Onyx, left Finland in late 2009. In April 2010 the ship changed hands again and the new owner, Red Line Shipping Ltd, renamed her Kaptain Boris and sailed her directly to Gadani Beach, Pakistan, where she was beached for scrapping on 8 May 2010.