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Shelter in place. Shelter in place (also known as a Shelter In-Place Warning SAME code: SPW) is to seek safety within the building you already occupy, rather than to evacuate the area or seek a community emergency shelter.
In making a trench, soil from the excavation is used to create raised parapets running both in front of and behind the trench. Within the trench are firing positions along a raised forward step called a fire step, and duckboards are placed on the often muddy bottom of the trench to provide secure footing.