If, for some reason, you fall into a black hole, two things would happen.
Into the black hole's singularity.
Should Earth ever collide with a black hole, it would get destroyed.
You would have a black hole the size of the combined mass of the two black holes.
It would be torn apart by tidal forces as it approached the black hole. Once it crosses the event horizon id disappears into the black hole forever.
No non-fiction person has ever gone into a black hole.
Black Hole - comics - happened in 1995.
Black Hole Assault happened in 1992.
A black hole can't really form inside of another black hole. If you think of a black hole forming after a star goes supernova, then there isn't really a star to go supernove inside of the already created black hole. In fact, there isn't even any space inside of the blak hole for anything to happen. Two black holes can join together, but they wil eventually go to one.
If you fall into a black hole, you'll go into the black hole and nowhere else.
It disappears forever
Well if it DOES happen and a black hole DOES destroy the Universe, then we won't be around to worry about it.
Objects which approach a black hole will get sucked into it.
Black Hole - video game - happened in 1981.
Into the black hole's singularity.
nothing
If you jumped into a black hole, you would be stretched into human spaghetti.
Should Earth ever collide with a black hole, it would get destroyed.