The s.s. 'Siva' was a steel hulled, single screw, steamer built by the Grangemouth & Greenock Dockyard Company Limited at Grangemouth in 1902 for J. T. Salvesen & Company Limited also of Grangemouth. She was of 1,740 gross and 913 net register tons being 270.3 ft. long x 37.0 ft. breath x 18.5 ft. deep. She was launched during July 1902.

In 1916 she was sold to Crosby Keir & Company of Liverpool and later that same year to Rederi B. Ingelsson of Helsingborg, Sweden and was renamed s.s. 'Ursa'. On 17th September 1918, whilst en-route Penarth to Rouen with a cargo of coal, she was torpedoed and sunk by UB-104 off Beer Head, Lyme Bay, Dorset. [334]

s.s. 'Ursa' - date between 1916 and 1918 at an unknown location. The Teign Diving Centre website adds : 'Bernhard Ingelsson - AB Kärnan, Helsingborg (Sweden). The Ursa was a Swedish steamer of 1740 tons, and 270 ft. in length. The SS Ursa was on passage from Penarth to Rouen with a cargo of 2,432 tonnes of coal. She was sighted by UB-104 under the command of Thomas Beiber on the morning of the 17th September 1918, 8 miles SSW of Beer Head, Lyme Bay. UB-104 torpedoed her and she was hit in hold number 1 at 05:15 hrs. She started to sink by the bow and was lost completely within 10 minutes. The Ursa's second mate was taken aboard the submarine UB-104 for questioning and then released back to his life boat and the whole crew of 19 reached the shore at Beer at 08:30 hrs on the 17/09/18.' [953]