On the evening of December 13, 1912, the three explorers pitched camp in the middle of yet another glacier. Mawson abandoned one of their three sledges and redistributed the load on the two others. Then the men slept fitfully, disturbed by distant booms and cracking deep below them. Mawson and Ninnis did not know what to make of the noises, but they frightened Mertz, whose long experience of snowfields taught him that warmer air had made the ground ahead of them unstable. “The snow masses must have been collapsing their arches,” he wrote. “The sound was like the distant thunder of cannon.”
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