You don't go through a black hole, you go into a black hole. And with present day technology, yes, it would crush you to raw energy.

About 1/8 into the earth. The core is pretty deep down.

No known person has been through a black hole. The nearest known stable (stellar mass) black hole is too far away for us to reach with our current technology, and an encounter with one would almost certainly be fatal.

It might sound crazy but an adult rat can fit through a 1/2 inch space! I don't think a 1/2 x 1/2 hole, but definitely a horizontal space that tall. Hope this helped!

The answer will differ depending on the size of the wires that are to be pulled through a one inch (25mm) hole.

How many 12/2 wires can be pulled through a 1" hole. I will also use some 14/2 and 12/3 .