SY Aurora was a 580-ton barque-rigged steam yacht built by Alexander Stephen and Sons Ltd. in Dundee, Scotland, in 1876, for the Dundee Seal and Whale Fishing Company. It was 165 feet (50 m) long with a 30-foot (9.1 m) beam. The hull was made of oak, sheathed with greenheart and lined with fir. The bow was a mass of solid wood reinforced with steel-plate armour. The heavy side frames were braced by two levels of horizontal oak beams. Her primary use was whaling in the northern seas, and she was built sturdily enough to withstand the heavy weather and ice that would be encountered there. That strength proved useful for Antarctic exploration as well and between 1911 and 1917 she made five trips to the continent, both for exploration and rescue missions.