This study presents a numerical model that couples the Discrete Element Method (DEM) with the Lattice Boltzmann Method (LBM) to investigate the influence of pore pressure on submarine landslides impinging against cables. DEM is employed to simulate the mechanical behaviour of granular materials, while LBM models the fluid dynamics of pore water. This coupled approach enables a detailed analysis of the interactions between submarine landslides and submarine cables, capturing the dynamics of pore pressure and its effect on the velocity field of both grains and fluid. The model has been benchmarked against values from the literature, demonstrating its reliability and accuracy in reproducing observed phenomena. Results highlight the critical role of pore pressure on the velocity field and forces acting on intruders.