Black Holes Actually Do Lead to Another Dimension
Think about it: scientists say that getting pulled into a black hole would tear you apart because of pressure and gravity but, honestly, how would they know? Obviously, someone would have to survive going through one to explain what happens. Call me crazy, but black holes have to lead to another universe or no one would be able to explain anything about them or somewhat understand them.
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They know the same way we know about all sorts of things in deep space that no human has ever been near and probably won’t be for a very long time, if ever—remote observation and math. The effects of gravity can be observed from far away, based on how objects around black holes behave. Additionally, via mathematical calculation, behavior of black holes can be calculated to ensure it’s logically consistent with the rest of the universe.
They almost definitely don’t lead to another dimension or universe. They’re just massively dense points of matter. The more dense something is, the more it affects other objects via gravity. Since singularities (black holes) are the most dense things known, they have the highest gravitational effect.