Geotechnical engineering is the science and art of working with the ground, focusing on the behaviour of soil, rock, and groundwater to ensure safe and sustainable construction. Hong Kong is a city characterized by steep terrain, dense urban areas, and frequent typhoons. Geotechnical engineers play a critical role in designing foundations, stabilizing slopes, and mitigating geo-hazards. Geotechnical engineers’ work spans ground investigations, reclamation projects, deep excavations, tunnelling, and underground space development—essential for supporting Hong Kong’s growth and resilience.