Although modern UMBHs within quasars and galactic nuclei cannot grow beyond around (5–27) × 10 M ☉ through the accretion disk and as well given the current age of the universe, some of these monster black holes in the universe are predicted to still continue to grow up to stupendously large masses of perhaps 10 M ☉ during the collapse of superclusters of galaxies in the extremely far future of the universe.