They sledged for 27 hours continuously to obtain a spare tent cover they had left behind , for which they improvised a frame from skis and a theodolite .
They had one week 's provisions for two men and no dog food but plenty of fuel and a primus .
men sledged for 27 hours continuously to obtain a spare tent cover men had left behind , for which men improvised a frame from skis and a theodolite .
They had one week 's provisions for two men and no dog food but plenty of fuel and a primus .