<p>A numerical model of an integrated system consisting of a moored multi-module floating platform edged with a vertical flap-type wave energy converter and submerged breakwater is presented based on a boundary element method code. The current research focuses on the dynamics of the multi-module submerged and floating structure equipped with a vertical flap under current and wind loads. The effects of wind and currents on the displacements of multi-module structures are demonstrated, and numerical results are analysed. The obtained results are compared with the other model simulations and experimental data sets, and a strong level of agreement is evident. Further, the present numerical results of connector forces and mooring tensions are also validated with the existing literature. The hydroelastic responses of floating articulated structures edged with a vertical flap type-WEC and submerged articulated structures are studied by analysing the effects of the stiffnesses of the moorings, hinges, and connection points on the response amplitude operator response of different motions subjected to current and wind. In addition, the wave transmission around the floating multi-module structure and its motion characteristics are demonstrated through contour plots and hydrodynamic diffraction. The theoretical expressions for the power capture and optimal damping of the PTO are presented. The proposed multi-module floating platform can be used as a base for different types of offshore applications, along with a flexible submerged platform that&#xa0;acts as a shielding structure for the floating system. It is observed that when the submerged structure is located close to the surface, the floating platform experiences less surge and heave motion, leading to a greater reduction in hydroelastic response.</p> Graphical abstract <p></p>