HMS Waterwitch ( 1892 ) HMS " Waterwitch " was a British hydrographic survey vessel active in eastern Asian waters from 1894 to 1912 . She was a wooden vessel , purchased from a private owner specifically for survey work . She was lost in a collision in Singapore harbour in 1912 . Construction and acquisition . She was built as a private vessel , " Lancashire Witch " in 1878 by R . Steel & Co of Greenock to a design by St Clare John Byrne for the owner , Sir Thomas George Fermor - Hesketh , 7th Baronet . She was of composite construction , meaning she was built with an iron keel , stem and stern posts , and iron framing , all planked with wooden planking . She was rigged as a three - masted schooner , with square - rigged sails on the foremast only ( a " barquentine " rig ) . A two - cylinder compound inverted steam engine of drove a single screw . She was described in " Lloyd ' s Yacht Register " as an " auxiliary screw steamer " . Career . Private yacht . In 1879 Sir Thomas Hesketh made a world cruise in " Lancashire Witch " , visiting Alaska in 1880 . An island in Kachemac Bay , Cook Inlet was named after Sir Thomas and rocks were named Lancashire Rocks after the yacht . There were a further 3 owners between 1883 and 1892 including Frank Linsly James , and on 17 March 1893 she was sold to the British Admiralty . She was renamed " Waterwitch " and rated as a sloop for survey work . Royal Navy survey vessel . " Waterwitch " was converted for use as a survey vessel , which included replacing her engine and boilers to provide 450 horsepower . She commissioned in 1894 for service on the Australia Station , undertaking a series of surveys on passage to the Cape of Good Hope . Once on station she made lines of soundings in Esperance Bay , Fiji and the Tasman Peninsula in preparation for the running of telegraph cables . Between 1898 and 1907 she worked the coast of China , including Hong Kong , Weihaiwei and the Yangtze River . She formed part of the British naval contingent involved in relieving the Peking legations during the Boxer Rebellion in 1900 and surveyed the north channel of the Yangtze prior to the battleship ' s navigation of the river . Socotra Rock was surveyed by " Waterwitch " confirming a depth of less than , and she met severe gales in the Formosa Channel in 1903 , and lost three men overboard . In 1906 she escaped being driven ashore in Chauan Bay by weighing anchor and steaming to safety in the calm of the storm - centre as it passed over . In 1908 , under Lieutenant Percy Douglas , she surveyed around Singapore and Klang , with work in this area continuing under other commanding officers until her fatal accident in 1912 . Loss . On 1 September 1912 , while lying at anchor off the north - eastern end of the mole at Singapore Harbour , " Waterwitch " was struck amidships by " Seamew " , the personal launch of the Governor of Singapore . " Seamew " had been heading around the breakwater for her usual berth and paid little enough attention to the position of " Waterwitch " that she drove right at her . The launch ' s sharp prow pierced " Waterwitch " s wooden side , and she then compounded her error by putting her engines hard astern . " Waterwitch " s bridge collapsed , her mainmast fell over the port side , and the resulting gaping wound in her side allowed an overpowering in - rush of water . Since her fires were out , no power could be raised , and so her anchor watch manned the pumps and a tug took her in tow . The wash from the tug increased the flooding and " Waterwitch " sank in of water . At low water , her masts , funnel , and the highest parts of her superstructure remained above water . Two members of her ship ' s company were drowned : Marine Sturgess knocked himself out diving overboard and was drowned , and an unnamed Chinese boy drowned between decks . A Board of Trade inquiry was held at Singapore from 20 to 23 September 1912 . Myth of the " White Ladye " . There are references indicating that HMS " Waterwitch " was formally " White Ladye " , at one time owned by actress Lillie Langtry . However , there is an audit trail from Lloyd ' s Yacht Register for the " White Ladye " showing that she was in private hands from the day she was built to when she was dismantled in 1935 and this is supported by contemporary newspaper articles .