High tech hell is reversing the light cone, pulling everyone who ever lived throughout history back into consciousness by simulating them at the neurotransmitter level, and then forcing them into actual hell / torture simulators with no way to die. All without consent, mind you.
That's also sci-fi. I hope.
What I described before - using clonal technology to solve nearly every disease - is a medical miracle that will vastly improve the state of people's lives throughout the world.
The two scenarios come in a package though. If you make one possible, the other one comes for free.
The same technology can also be used to force people to live with bodies engineered to make their existence a living hell. Similar things can be done with brain uploads.