Within the large A-frame structure is the restored Royal Canadian Mounted Police Schooner St Roch. Built in 1928 to serve as a supply ship for isolated, far-flung Arctic RCMP detachments, St Roch was also designed to serve, when frozen in for the winter, as a floating detachment, with its constables mounting dog sled patrols from the ship. Between 1940 and 1942, St Roch navigated the Northwest Passage, arriving in Halifax harbour on October 11, 1942. St Roch was the second ship to make the passage, and the first to travel the passage from west to east.