Rather lighter in the water than most crude carriers, PRISCO ALCOR was seen heading into Loch Long to complete her discharge of Nigerian oil. She had arrived from Rotterdam where she had discharged the bulk of her cargo before coming to the Clyde. Belonging to the Russian-based Primorsk Shipping Corporation but managed by their Singapore office, PRISCO ALCOR was built in 2007 in Korea by Hyundai. When new, the 166,546 tonne deadweight Suezmax tanker was one of the largest tankers to operate in the Baltic Sea. She is 285 metres overall.