  The Strong Cosmic Censorship conjecture states that for generic initial data
to Einstein's field equations, the maximal globally hyperbolic development is
inextendible. We prove this conjecture in the class of orthogonal Bianchi class
B perfect fluids and vacuum spacetimes, by showing that unboundedness of
certain curvature invariants such as the Kretschmann scalar is a generic
property. The only spacetimes where this scalar remains bounded exhibit local
rotational symmetry or are of plane wave equilibrium type.
  We further investigate the qualitative behaviour of solutions towards the
initial singularity. To this end, we work in the expansion-normalised variables
introduced by Hewitt-Wainwright and show that a set of full measure, which is
also a countable intersection of open and dense sets in the state space, yields
convergence to a specific subarc of the Kasner parabola. We further give an
explicit construction enabling the translation between these variables and
geometric initial data to Einstein's equations.
