Working in deep trenches exposes construction workers to serious hazards, including soil collapse, falling materials, water accumulation, underground utility damage, and oxygen-deficient or hazardous atmospheres. Before trenching begins, the site team should assess soil conditions, identify buried electrical cables and pipelines, and establish suitable protective measures. Depending on the soil, depth, and site conditions, appropriate systems such as shoring, shielding, sloping, or benching should be used to prevent cave-ins. Excavated soil, machinery, and heavy materials should be kept away from trench edges to reduce pressure on the surrounding ground.

Safe access and exit points, such as properly positioned ladders, should be provided, and trenches must be inspected by a competent person before entry and after events that could affect stability. Water accumulation should be controlled, while atmospheric testing and ventilation should be provided where hazardous conditions may exist. Workers must never enter an unprotected or unsafe trench. Proper excavation planning, protective systems, regular inspections, and effective supervision are essential for preventing trench accidents and protecting construction workers.