The model of a vacuum as a quantum-hydrodynamical continuum is proposed. According to the hypothesis a vacuum consists of particles with Plank’s scales named as etherons. Particles form the Boze-condensate and their collective dynamics is described by the hydrodynamic equations. The dependence of the quantum-mechanical pressure versus the fluid density is nonlocal and contains Planck’s constant. It is shown that two types of waves can propagate in condensate. The gravitational waves are quantum longitudinal oscillations of density of etherons. The other type is electromagnetic waves which are transverse elastic oscillations of turbulent continuum of etherons on the scales much more than Planck’s length.