Book excerpt: When an explosion occurs in the atmosphere above a water surface, most of the energy in the resulting shock wave will be reflected upon striking the air-water interface; however, some portion of the energy will be transmitted through the interface and propagate into the water. The experimental study, designed to provide quantitative information on the induced water shock as well as verigy theoretical findings, was conducted in a trapezoidal-shaped test basin 250 ft long, 150 ft wide (midpoint), and 20 ft deep. It involved the detonation of some sixty 21-lb spheres of TNT positioned at various distances above the water surface, and pressure-time histories of the induced water shocks were measured at spatial positions underwater for depths ranging from just beneath the surface to middepth. (Author).