Answer: Down Below
Explanation: The engineers noted that the area was prone to rockfalls and landslides. They proposed a plan to secure the rocky hillside slopes using: 1. Rock bolting: This involves drilling holes into the rock face and inserting long bolts to hold the rocks in place and prevent them from falling. 2. Slope stabilization mesh: Installing a mesh system on the slopes to stabilize loose rocks and prevent them from sliding down. 3. Soil nailing: Driving long, slender nails into the slope to reinforce and stabilize the soil, making it less prone to landslides. 4. Retaining walls: Building retaining walls along the base of the slopes to support the weight of the rocks and prevent them from collapsing. 5. Vegetation planting: Planting vegetation on the slopes to help stabilize the soil and rocks, reducing the risk of erosion and landslides. These methods are commonly used to secure rocky hillside slopes and mitigate the risks of rockfalls and landslides in such areas.