The UCBF Aether Theory V6.4 presents a fully unified physical framework built on a single premise: the vacuum is not empty, but a structured, elastic medium with its own density, stiffness, and internal coherence. All known forces and particles arise as motions, twists, or localized knots within this medium. In this model, gravity is produced by slow, large-scale compression of the vacuum; electromagnetism emerges from transverse shear waves; and the full set of gauge forces—electromagnetic, weak, and strong interactions—arise from the torsional dynamics of a three-dimensional orientation field embedded in the vacuum. The strengths of these forces are not inserted by hand, but follow from the mechanical properties of the medium itself. Matter appears not as a separate substance but as stable, topologically protected torsion knots—solitons—that carry spin, charge, and flavor. Their masses arise from the way these knots twist and interact with the surrounding medium, naturally producing the observed hierarchy between particle families without introducing arbitrary parameters. The strong interaction is reinterpreted as a consequence of vacuum torsion becoming highly resistant to stretching, producing tube-like structures that bind quarks together. Baryons and mesons form through simple geometric combinations of these torsion knots. Cosmology follows from the background strain stored in the vacuum. This built-in tension drives accelerated expansion and produces an evolution compatible with standard observations, while adding subtle high-frequency corrections that imprint themselves on the small-scale structure of the cosmic microwave background. An early inflation-like phase and a natural reheating mechanism arise from the relaxation of the vacuum’s nonlinear stiffness. In extreme environments such as black hole horizons, the medium responds with finite-strain effects that slightly modify predicted oscillation patterns. At laboratory scales, the theory predicts an additional contribution to magnetic pressure—large enough to be measurable—providing a direct experimental signature. All predictions of the framework, from gravity to particle behavior to cosmology, emerge from a single set of vacuum properties. UCBF Aether Theory V6.4 is therefore presented as a fully closed, internally consistent unification model in which every physical phenomenon traces back to the structure and dynamics of one universal medium.