The study focuses on the complex network of underground crossing tunnels in demand in most megacities. Considering the various disasters around us, the dynamic behaviour of crossing tunnels is paramount. Therefore, the objective of the work is to inspect the dynamic type of behaviour of vertically stacked cross-tunnels that are aligned perpendicularly at varying pillar depths. Therefore, three-dimensional finite element modeling (FEM) was carried out to explore the innovative concept of intersecting tunnels within a sandy soil environment. Two types of cross-tunnels are considered: one above the existing tunnel and the other below the existing one. The tunnel response is validated with previously performed centrifuge model tests that consider both flexible and rigid tunnel linings in dry fraction E sand. A parametric study is done with different amplitudes of harmonic waves to study multiple response variables of the soil and the tunnel linings. These are presented across five cross-tunnel cases at different depths that take care of the varying rigidity of tunnel linings compared to the surrounding soil medium. This in-depth analysis of dynamic loading on cross-tunnels will help researchers and decision-makers focus on the highly critical areas of the crisscrossing underground tunnels.