This study examines how temperature, salinity, and ocean currents vary with depth in the Bay of Bengal under long-term average conditions. A simulation was carried out using the CROCO ocean model with input from the World Ocean Atlas 2009 for subsurface data and COADS05 for surface atmospheric conditions. By excluding seasonal and yearly changes, the model focuses on the ocean’s background vertical structure. The results reveal a distinct thermocline and salinity-driven layering, especially in surface waters. The analysis also shows changes in current direction and magnitude with depth. These findings help build a clearer reference state for the region’s vertical ocean structure. However, features like storms, eddies, or seasonal events are not represented, as the setup was designed for stable climatological conditions. Future research may use dynamic data and enhanced model detail to better reflect the natural variability of the Bay of Bengal.