This master’s thesis investigates pressure amplification in dual underwater explosions and its relation to dual-sided initiation of explosives. By utilizing exploding foil initiators, highly precise and simultaneous detonation can be achieved, enabling controlled investigations of colliding shock waves. The study combines analytical formulations, experimental investigations, and two separate numerical simulations based on 2D axisymmetric S-ALE models implemented in LS-DYNA. The fluid model is analyzed through these approaches, including an underwater experiment in which two explosive charges were detonated at a separation distance of 1.5 m to validate the numerical simulations. The verification results show good agreement between the numerical simulations and the semi-analytical calculations, while the experimental data demonstrate reasonable agreement with the numerical and analytical predictions for several measured quantities. For the dual-sided initiation of explosives, a numerical model was developed and verifiedusing the Chapman–Jouguet pressure as a reference. The verification revealed an underprediction of the detonation wave pressure, which was found to depend on both mesh resolution and timestep size. In both the fluid and explosive models, shock and detonation waves were collided to investigate their interaction behavior. The angle of incidence, post-collision wave dynamics, and pressure decay over time were analyzed for both types of waves. Additionally, the fluid model included an investigation of the relationship between incident pressure and amplification. The results indicate that pressure amplification differs significantly between colliding shock waves in a fluid and detonation waves in an explosive. In particular, detonation wave interactions are more sensitive to the angle of incidence and do not achieve the same amplification ratios as shock waves in an unbounded domain, contributing to an improved understanding of wave interaction phenomena in explosive environments.