Objects with rough surface texture creates underwater cylindrical air cavities on impacting water pools, influencing underwater trajectory, structural integrity and drag forces associated with the impacting bodies. A great deal of studies has looked into these parameters for single sphere water entry cases, with little research focusing on multiple projectile entry. This study explores a novel simultaneous two-sphere water entry system, elucidating how the two interacting cavities created by the spheres leads to a shorter seal time for both of them, and how this sealing time depends on the horizontal distances between the two spheres
