The book uniquely emphasizes long-term sustainability, acknowledging both the advantages and disadvantages of underground infrastructure. Readers will discover how advancements in boring technology, ventilation systems, and safety protocols have made extensive, multi-lane underground highways a realistic option. It analyzes the cost-effectiveness of tunnel projects, considering construction expenses, maintenance, and revenue generation. The work progresses through technological aspects, case studies, economic models, and environmental impacts, providing a comprehensive overview of this evolving field.