After reaching Cape Crozier on 15 July, the party built an igloo from snow blocks, stone, and a sheet of wood they had brought for the roof.[90] They were then able to visit the penguin colony and collect several emperor penguin eggs.[91] Subsequently, their igloo shelter was almost destroyed in a blizzard with winds of force 11 on the Beaufort scale. The storm also carried away the tent upon which their survival would depend during their return journey, but fortunately this was recovered half a mile away.[92] The group set out on the return journey to Cape Evans, arriving there on 1 August.[93] The three eggs that survived the journey went first to the Natural History Museum in South Kensington, and thereafter were the subject of a report from Cossar Stewart at the University of Edinburgh.[94] The eggs failed to support Wilson's theories.[95]