ISCO is apparently the current theoretical limit for orbiting black holes (as sourced by wikipedia).
I was reading this question and many different answers eluded to the Event Horizon being the theoretical limit for orbiting a black-hole and that "bad things happen" when you dip beyond the event horizon. Is this inclusive or exclusive? Provided we were able to reach the orbital velocity required to orbit a black hole 1 mile away from the event horizon (excluding orbital drift), what would happen if we adjusted the orbit to EQUAL the event horizon, but not exceed it?
I understand the scientific possibility (with current technology) is 0%, but theoretically what would happen if we tried to orbit a black-hole AT the event horizon?
Based on the current answers, I'd like to shift the future answers to a more theoretical realm. I now understand that orbiting a black hole AT the event horizon is the SAME as being beyond it. Theoretically, how close could we approach the event horizon if we were to assume our craft is indestructible as dictated by our current understanding of physics (I realize studying a black hole up-close will likely redefine physics forever).