What is tunneling? Describe the hazards and risks involved in tunneling

Tunneling is the process of excavating a tunnel through various underground materials, including soil, rock, or other types of earth. It is commonly used in the construction of highways, subways, water supply systems, and underground utilities. The construction of tunnels involves complex engineering techniques and specialized equipment to ensure stability ____ ________ ___ __________ ________ ________ __________ ________.
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