A deep excavation collapse in Vancouver, Canada. A deep excavation in construction can collapse due to a variety of factors, often related to the instability of the surrounding soil and insufficient support systems. If the excavation walls are not properly reinforced with shoring, bracing, or retaining structures, the soil can shift or erode, leading to a sudden collapse. Poor understanding of soil conditions, such as the presence of weak or waterlogged soils, can exacerbate the risk. Additional