fitted as a ketch, with her own mainmast and a mizzenmast made by cutting down the mainmast from the Stancomb-Wills, rigged to carry lug sails and a jib. The weight of the boat was increased by the addition of approximately 1 long ton (1 tonne) of ballast, to lessen the risk of capsizing in the high seas that Shackleton knew they would encounter. Worsley believed that too much extra ballast (formed from rocks, stones and shingle taken from the beach) was added, making the boat excessively heavy, giving an extremely uncomfortable 'stiff' motion and hampering the performance for sailing upwind or into the weather. However he acknowledged that Shackleton's biggest concern was preventing the boat capsizing during the open-ocean crossing. The boat was loaded with provisions to last six men one month; as Shackleton later wrote, "if we did not make South Georgia in that time we were sure to go under". They took ration packs that had been intended for the transcontinental crossing, biscuits, Bovril, sugar and dried milk. They also took two 18-gallon (68-litre) casks of water (one of which was damaged during the loading and let in sea water), two Primus stoves, paraffin, oil, candles, sleeping bags and odd items of spare clothing. Shackleton's first choices for the boat's crew were Worsley and Tom Crean, who had apparently "begged to go". Crean was a shipmate from the Discovery Expedition, 1901–04, and had also been with Scott's Terra Nova Expedition in 1910–13, where he had distinguished himself on the fatal polar march. Shackleton was confident that Crean would persevere to the bitter end, and had great faith in Worsley's skills as a navigator, especially his ability to work out positions in difficult circumstances. Worsley later wrote: "We knew it would be the hardest thing we had ever undertaken, for the Antarctic winter had set in, and we were about to cross one of the worst seas in the world". For the remaining places Shackleton requested volunteers, and of the many who came forward he chose two strong sailors in John Vincent and Timothy McCarthy. He offered the final place to the carpenter, McNish. "He was over fifty years of age", wrote Shackleton of McNish (he was in fact 41), "but he had a good knowledge of sailing boats and was very quick". Vincent and McNish had each proved their worth during the difficult boat journey from the ice