This book discusses innovations in the field of Directed Energy (DE) and presents new technologies and innovative approaches for use in energy production for possible Underwater Communication, Directed Energy Weapons Applications and at lower wave energy for Medical Applications as well. In-depth chapters explore the challenges related to the study of energy produced from Scalar Longitudinal Wave (SLW). Topics related to Scalar Longitudinal Waves (SLW) and their various applications in the energy, medical, and military sector are discussed along with principles of Quantum  Electrodynamics (QED) and theory, weapon applications of SLW, as well as SLW driven propulsion via an all-electronic engine, and for underwater communications. Scalar Wave Driven Energy Applications offers a unique solution for students, researchers, and engineers seeking a viable alternative to traditional approaches for energy production.