The disappearance in 1845 of Sir John Franklin and his crew in the Canadian Arctic set off the greatest rescue operation in the history of exploration. More than 30 expeditions over two decades would search by land and sea for clues as to his fate, in the process charting vast areas of the Canadian Arctic and mapping the complete route of the Northwest Passage. The search for clues continued into the 20th and 21st centuries. On 9 September 2014, it was announced that one of the expedition ships, later identified as the HMS Erebus, had been found off King William Island. On 12 September 2016, a team from the Arctic Research Foundation announced that they had located the Terror in Nunavut's Terror Bay, north of where the Erebus was found.