The successful planning, design, and construction of tunnels depends heavily on an accurate description of the ground conditions. Innovative ground characterization methods must be used where geological complexity poses serious difficulties like in the Lesser Himalayan region. This study investigates the use of integrated seismic prediction and probe drilling in the ground characterization of tunnels used in Rishikesh-Karanprayag BG Rail line project, Tunnel 8, Package 4, for portal 1 where TBM tunnelling method applies. An in-depth insight of the subsurface conditions is provided by the integrated approach, which combines seismic prediction techniques with probe drilling. The velocity and density fluctuations within the rock layers are discovered using seismic prediction techniques, such as seismic refraction and reflection surveys. These studies aid in locating faults, fractures, and other geological characteristics that could affect the integrity of tunnels. Probe drilling is carried out at precise locations to obtain actual fragments of the subsurface materials in conjunction with seismic prediction. The geotechnical characteristics of the samples, such as strength, permeability, and compressibility, are examined. This information is essential for determining the stability of the ground, determining and planning efficient excavation techniques and TBM advance rate. This study approach makes it easier to create realistic geological models by enabling the detection and delineation of geological features. The results demonstrate effectiveness and adaptability of this method in describing the ground conditions for tunnel construction in challenging geological contexts.