SRL for [bivouacked]: He started down at once but , overtaken by darkness and fearing crevasses , he [bivouacked] in a small crevasse without sleeping bag , tent or stove .
ARG-M-PRD: overtaken by darkness and fearing crevasses | ARG-0: he | ARG-1: in a small crevasse | ARG-M-MNR: without sleeping bag , tent or stove