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The maximal globally hyperbolic development of non-Taub-NUT Bianchi IX vacuuminitial data and of non-NUT Bianchi VIII vacuum initial data is C2inextendible. Furthermore, a curvature invariant is unbounded in the incompletedirections of inextendible causal geodesics.Comment: 20 pages, no figures. Submitted to Classical and Quantum Gravit

Curvature blow up in Bianchi VIII and IX vacuum spacetimes