In the realm of construction, especially for subterranean structures like tunnels and caverns, obtaining detailed and accurate subsurface data is crucial. Traditional exploration methods often leave gaps in this data, posing challenges for project decision-makers. Geophysical methods emerge as a promising alternative, offering a swift, cost-effective way to gather extensive subsurface insights, thus enhancing geotechnical assessments. The advent of modern technology and portable digital systems has amplified the efficacy of geophysical methods in site analysis and underground condition evaluation. These cutting-edge geophysical explorations not only complement but also optimize traditional exploration, paving the way for faster and more economical underground construction ventures. Furthermore, geophysical surveys are pivotal in ensuring construction quality and conducting non-invasive health assessments of underground infrastructures throughout their lifespan. This paper elucidates the diverse applications of geophysical methods across various phases of underground projects, from inception to maintenance. It also highlights the latest innovations in geophysical research, emphasizing its transformative potential in tunnel projects, ultimately elevating economic viability and structural integrity.