Inscribed by the artist, as title, lower right. There were four channels at Scapa Flow obstructed with blockships and it is unclear wch this is. Holm Sound between Burray and Holm was blocked by 'Aorangi' (1883) sunk 4 September 1915, 'Minieh' (1876) sunk 27 February 1915, 'Numidian' (1891) sunk 30 December 1914 and 'Thames' (1887), sunk 7 January 1915. Skerry Sound between Lamb Holm and Glims Holm was blocked by 'Almeria' (1888) sunk 20 February 1915, 'Argyle' (1872) sunk 17 September 1914, 'Elton' (1880) sunk 3 October 1914, 'Reinfeld' (1893) sunk 2 October 1914, 'Teeswood' (1882) sunk 19 September 1914 and 'Rosewood' (1889) sunk 18 September 1914. East Weddel Sound north of Burray was blocked by 'Reginald' (1878) sunk 15 September 1915, 'Gartmore' (1880) sunk 14 September 1915 and 'Lapland' (1890) sunk 16 September 1915. Water Sound between Burray and Ronaldsay was blocked by 'Clio' (1889) sunk 29 November 1914, 'Lorne' (1873) sunk 17 September 1915 and 'Pontos' (1891) sunk 30 November 1914. See also PAE3500. The inverted, rough pencil sketch at bottom appears to be an unrelated one of the stern of a naval two-decker of the Nelsonic period.