A movable arch was then erected spanning the trench
Philip K Swartz - 1960-61 - South Pole Station - Antarcticans Database Project more

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Metal arch pieces then placed, and the stored snow was then packed over the arch, and the arch moved further along the trench; thus creating a tunnel that was supposed to be self-supporting.

Pictures from Philip K Swartz, overwinter, South Pole, 60-61