Underwater explosions produce a shock wave that travels farther than a comparable explosion in air because water is not compressible. e gas created from an underwater explosion forms an expanding bubble that generates a shock wave as the bubble breaks up and rises to the water surface. e blast waves are reŒected from the surface of the water and from the bottom of the body of water. Consequently, the blast waves in an underwater explosion are more complex with regard to pressure changes (Bellamy et al. 1991).