The most complete text on underwater sound propagation in today’s literature. Originally written for the Defense Advanced Research Projects Agency, this edition incorporates corrections and an additional chapter on underwater propagation modeling. In this book, Urick has assembled details on all aspects of sound propagation: basic theory, speed of sound, attenuation and absorption, the surface duct, deep sound channel, caustics and the convergence zone, propagation models, shallow water ducts, reflections and scattering, fluctuation, spatial coherence and multipath. The book has 350 references. It is an essential book for systems engineers, sonar designers and oceanographers dealing with antisubmarine warfare, mine warfare, geophysical survey and oil explorations.