How close can an object get to a black hole if it's anchored in this space with some sort of ';tether';?

More specifically, what I'm wondering about is the ';gravity so powerful that nothing can escape'; bit. If an object is tethered to this cosmos by some super-massive tethering equipment from many different angles, it seems like we might be able to let the object cross the event horizon and still get it back. Just slightly over the lip of the event horizon, light may not be able to escape but something anchored here might prove strong enough. Or not? :-?How close can an object get to a black hole if it's anchored in this space with some sort of ';tether';?
Not strong enough...


If it passed the event horizon, we wouldn't know. It would seem to us to be close to the edge for an infinite amount of time.How close can an object get to a black hole if it's anchored in this space with some sort of ';tether';?
Your question is sort of like ';What do you do when a grizzly looks like he wants to go down the path you're on.'; Answer: get out of his way.





We cannot conceive of a mass so large that it it does all the strange things it does. Or a density for that matter. The laws of inertia are in operation here: when it moves it keeps moving until some external force can stop it.





We do not have a force that could tie a black hole up like it was a steer. If ever there was a candidate for an immovable object, the black hole is it. We have no counter to it. We should just get out of the way.
the gravitational differences between one en of the tether to the other become so great that it will be ripped apart no matter what its made of, the ripping is a result of molecular bonds not being strong enough.





this of course dosn't mention something as absurd as being able to anchor something in space.
An interesting question. When you lower an object on a tether, the tension in the tether becomes infinite when it reaches the event horizon. So nothing would be strong enough to hold it. If you wrapped a very very very very strong tether round a drum fixed to the axle of an electric generator, you could convert matter to energy by lowering rubbish into a black hole. But to get the energy equivalent of the mass that disappeared, Mc^2, you'd need an infinitely strong tether. More realistically, if you had some way to capture the electromagnetic and gravitational radiation from matter spiralling into a black hole and heating up as it fell in, you could capture about half of its energy equivalent. Gravitational radiation is usually very weak, but in some situations about 30% of the energy equivalent is radiated as gravity waves when mass falls into a black hole. Just to give an idea of how much energy is involved, converting a kg of dogshit completely to energy would give you 25 billion kilowatt hours, which here in New Zealand is worth about 3 billion US$. If you've got a rotating black hole, you can extract energy by flying into the ergosphere, which is just outside the event horizon and dumping your rubbish into the black hole. You then fly out of the ergosphere and escape with more energy than you started with.