Which unsafe condition may need checking during excavation work?

During excavation work, flooding is a significant unsafe condition that requires careful checking. Flooding can lead to unstable soil conditions that may increase the risk of landslides or collapses, posing a serious threat to the safety of workers and equipment. Waterlogged soil can lose its ability to support structures, making it crucial to assess the presence of water before and during excavation activities.

In comparison, sunny weather, open air, and stable ground, while they may present their own challenges (such as heat stress or ensuring proper ventilation), do not typically require the same level of concern regarding immediate safety hazards as flooding does. Flooding directly impacts the integrity of the excavation site and the safety measures necessary to protect workers involved in the excavation process.