Because the average density of a black hole inside its Schwarzschild radius is inversely proportional to the sq. of its mass, supermassive black holes are much less dense than stellar black holes. The average density of a 108 M☉ black hole is comparable to that of water.[184] As a result, https://econopass.com/news/science-technology/7-mind-blowing-ways-the-technological-singularity-will-transform-humanity/