S17: Arctic Challenges
Video duration: 2:53
By September of 1942, the Army Corps of Engineers building the Alaska Highway had struck permafrostground that had been frozen for two or more years. After removing the covering vegetation, the frozen ground began to thaw, creating mud. Permafrost wasnt the only challenge the engineers faced. In October, temperatures began to drop, signaling the start of one of the coldest winters on record.