Inside the US facility where 199 'legally dead' humans and almost 100 pets await being revived

On the wall full of patients' portraits is Matheryn Naovaratpong from Thailand who lost her life at an early age.

"[She is] by far our youngest patient, not quite three years old... who had brain cancer. Both her parents were doctors and she had multiple brain surgeries and nothing worked, unfortunately," said Max More, President emeritus of the cryonics facility Alcor Life Extension Foundation in Arizona, the United States.

According to More, the facility currently accommodates 199 people and almost 100 pets inside tanks filled with liquid nitrogen in hopes to revive them when technology has been advanced enough to treat them.

He says the patients are only "legally dead" but not biologically and believes cryonics could be their saviour.

The process is a lot more complicated than just freezing and defrosting.

After the patient has been declared legally dead, the body will be soaked in an ice bath.

During this procedure, a mechanical CPR device is used to ensure blood circulation and medications in order to protect the cells against damage.

More says this prevents the patient from returning to consciousness and blood clots. He also adds maintaining blood pressure is crucial for viability, much as in the organ donation process.

He says the bodies are not technically frozen, but vitrified.

"We don't want to freeze the patient. We want to vitrify them... And the reason is that once you cool to very cold below freezing, the solution, instead of crystallising, will just get thicker and thicker and it's like a glassy block holding all the cells in place without any internal structure and so does no damage," said More.

"And once we reach that point, around minus 110 degrees, the body becomes truly solid and absolutely nothing is happening