We don't know that such a person couldn't eventually enter an inner world where they find a kind of peace and fulfillment. It doesn't necessarily have to be a continual conscious horror of being frozen in a hospital bed.

I've read some of the literature on sensory deprivation experiments, and... let's just say you are more of an optimist than I am.

What if they learn to meditate like a monk? Certainly there are people who can enter altered states of consciousness for extended periods who could perhaps tune out the torturous effects of any sensory deprivation.