  Given a complete hypersurface isometrically immersed in an ambient manifold,
in this paper we provide a lower bound for the norm of the mean curvature
vector field of the immersion assuming that:
  1) The ambient manifold admits a Killing submersion with unit-length Killing
vector field.
  2)The projection of the image of the immersion is bounded in the base
manifold.
  3)The hypersurface is stochastically complete, or the immersion is proper.
