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To subscribe, E-mail the words . . According to the Philadelphia Inquirer, the men tried to escape but were not able to outrun the collapsing clay. Trench construction is a well-known technology. Shoring up the sides of an earth trench to prevent collapse is something civil engineers have known how to do for many years. Don Allendorf, OSHA area director, said neither of these precautions was being used when the trench collapsed.