This research is intended to analyse the effect of seawater depth on sea seakeeping analyses. So it's crucial to understand ship motion on waves. As a result, precise hydrodynamic/motion force forecasts in constrained waterways is essential. The goal of this research is to look into how water depth affects ship heave motion. It is quite important to understand how floating offshore pontoon behave in deep and shallow water due to renewed interest of Nigeria Energy company in offshore exploration. Therefore accurate prediction of heave force will be analysed in this research. This study uses the linear wave theorem, Response Amplitude Operator, to estimate the hydrodynamic forces that occur in deep and shallow water. Bonny Island, Nigeria tidal wave using a depth of 500 and 5 meters. The results obtained in this research reveal a rapid decrease in heave response displacement from 0 to 0.2 wave frequency. According to the data, FOP operation is optimum at 500m seawater depth, where the effect of heave motion is less noticeable as shown in this research as at when compared to a 5m depth.
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