Lattice Attenuation: Why High-Energy Events Do Not Destroy the Vacuum

The FCC vacuum lattice theory posits that the quantum vacuum is a crystalline structure of electron-positron strings under tension. A standing problem in quantum field theory is why high-energy events (gamma rays, cosmic rays, black hole mergers) do not catastrophically destroy the vacuum. We derive a lattice attenuation mechanism: energy is shared among adjacent lattice steps, diffused, and thermalized to the ground state. The attenuation length is λ ≈ 10^{-11} m, and the DCE threshold is E_th = Tℓ_0 ≈ 3.7 keV. Below threshold, energy is radiated as photons. Above threshold, electron-positron pairs are produced. The mechanism explains the stability of the universe and makes testable predictions including Casimir force deviations at the lattice spacing scale, Schumann resonance acoustic modulation, optical DCE with orbital angular momentum, and Lorentz violation at MeV scales.