  We show that voids adjacent to radiation damage cascades can be moved in
their entirety by several lattice spacings. This is done using molecular
dynamics cascade simulations in iron at energies of 1-5 keV. The effect of this
mechanism is studied further using an OKMC code and shows enhancement of void
diffusion by 2 orders of magnitude from 1x10^-22 cm^2/s to 3x10^-20 cm^2/s.
Repeating the study on He bubbles shows that the movement is damped by the
presence of helium in the void.
