HMS Opal (1915)  HMS "Opal" was an Admiralty M-class destroyer of the Royal Navy. She served in the First World War following her construction at Sunderland in 1915. Attached to the 12th Destroyer Flotilla based with the Grand Fleet at Scapa Flow, "Opal" had an eventful short life, which ended in shipwreck after two and a half years of service. "Opal" was one of 25 destroyers (consisting of 22 M-class destroyers and three s) ordered in late November 1914 as part of the Third War Programme. The M class was the latest class of destroyers ordered for the Royal Navy before the outbreak of the First World War, and this order was one of a series of large orders for destroyers of this class placed in the early months of the war which resulted in 90 ships being ordered by May 1915 in addition to ships ordered prior to the outbreak of the war. "Opal" was laid down at William Doxford & Sons shipyard in Sunderland on 1 February 1915, and was launched on 11 September 1915. The ship reached a speed of during sea trials early in 1916, and commissioned in April 1916. On commissioning, "Opal" joined the 12th Destroyer Flotilla, based at Scapa Flow as part of the Grand Fleet. "Opal" took part in the Battle of Jutland where the Twelfth Flotilla supported the Grand Fleet, and both attacked and was attacked during the general action. She also participated in other major fleet sorties during the next two years as well as pursuing her regular duties of minesweeping, convoy protection and anti-submarine patrols in the North Sea. On 24 July 1917, "Opal" and the destroyer were escorting an east-bound convoy on the Scandinavian (Lerwick–Norway) route, when the convoy came under attack by the German submarine , which fired two torpedoes from distance at the convoy, one of which hit and sunk the Swedish merchant ship . In response, "Opal" followed back the track of the torpedo and dropped a depth charge on the estimated location of the submarine, but "U-67" escaped unharmed. On 12 January 1918, "Opal" joined her sister ship and the light cruiser in a night patrol to hunt German auxiliary warships suspected to be laying mines on the Scottish coast. By 17:30, the weather had deteriorated to such an extreme degree that the destroyers were in danger of swamping and foundering and visibility was near zero.