Inside a blackhole singularily, the center is pulling spacetime to it, but because the spacetime fabric inside and outside the event horizon are connected... it doesn't shear or break. But during a Big Crunch, the entire spacetime of the universe would be sucked back into the singularity and there would be no spacetime outside the singularity. My question is. What must be the mass of black holes before it can shred the spacetime fabric at the event horizon and sucking the spacetime inside the event horizon into the singularity? How do you calculate for it?