This student module on excavating, trenching, and shoring safety is one of 50 modules concerned with job safety and health. This module outlines the hazards of trenching and shoring and the procedures and equipment that should be employed to prevent cave-ins and other trenching and shoring accidents. Following the introduction, 10 objectives (each keyed to a page in the text) the student is expected to accomplish are listed (e.g., Discuss the "angle of repose"). Then each objective is taught in detail, sometimes accompanied by illustrations. Learning activities are included. A list of references and answers to learning activities complete the module. (CT)