In Scottsdale, Arizona, there are tanks filled with liquid nitrogen are the bodies and heads of 199 humans who opted to be cryopreserved (some along with their pets) with the hopes of being revived in the future.

Many of the patients - as Alcor Life Extension Foundation calls them - are people who were terminally ill with cancer, ALS or other diseases with no cure in the present day.

"So they're not really dead, they're just legally dead... It puts dying on a pause and lets you go into the future where we have greater capabilities to reverse that and bring you back to life," Alcor’s former CEO, Max More said while giving a tour of the facility.

It costs a minimum of $200,000 to freeze a body and $80,000 for the brain alone.

But there are skeptics in the medical world, where the idea of cryonics is far-fetched. "I think this notion of freezing ourselves into the future is pretty science fiction and it's naive," Arthur Caplan, professor of bioethics at NYU said in an interview.

"It's almost like what you'd be thinking about in a college dormitory discussion, if I could just freeze myself and then defrost myself kind of like a bag of peas and wind up way in the future, wouldn't that be cool?"

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