Well, for actual _physical_ suffering, I'll choose just about anyone rather than Avon, it seems. Whether I like his coping mechanisms or not, I think they're up to it.
Neil, in this point you have shown the true flaw of Deliverance. Truth is, someone long before Meeghat would have gotten curious and started playing with the buttons and wires. It's human nature to investigate what isn't understood. They'd have at least figured out how to turn on the lights.