  A physical interpretation of the recently discovered vast class of vacuum
space-times, which stably violate the strong cosmic censor conjecture (in its
usual broad formulation) in four dimensions, is exhibited. Namely, by
elementary Morse theory we demonstrate that these geometries describe
transitions between topologically different spacelike hypersurfaces. More
precisely, in these four dimensional smooth vacuum space-times there exist
three dimensional spacelike hypersurfaces which display an increasingly violent
unbounded oscillation between topologically different closed, orientable
three-manifolds as one moves towards the asymptotic region in their ambient
space-times. Moreover this spatial oscillation appears as a cosmological
redshift for late time observers. Therefore these new vacuum solutions shed
some light onto the deep dynamic regime of general relativity and the structure
of the four dimensional continuum itself.
  This picture, beyond offering a physical clarification how global
hyperbolicity breaks down in these solutions, is also consistent with the fact
that the Riemannian counterparts of these Lorentzian vacuum geometries are not
only Ricci-flat but even self-dual four-manifolds hence give rise to
gravitational instantons. Consequently the role of these Riemannian solutions
is similar to that of Yang--Mills instantons in semi-classical non-Abelian
gauge theories over Minkowski space-time.
