Experts decidedly consider his research on spinal cord repair, let alone whole head transplants, unconvincing. A medical ethicist dubbed Canavero “out of his mind” for sweeping past the currently insurmountable challenges of such feats. These include intricately repairing and reattaching thousands of delicate nerves and restoring function. Right now, doctors can’t even convince the immune system to accept far simpler transplants consistently. There’s also the completely unknown effects of such a transplant on the powerful human psyche.

Canavero is carrying on, undeterred it seems. In his Ooom interview, he not only glided through the idea of successfully transplanting a head, he made an even more absurd claim: that he would revive a cryogenically frozen brain and transplant it into a donor body. Canavero said he would obtain a preserved brain from Alcor Life Extension Foundation, a cryonics company located in Scottsdale, Arizona, according to Gizmodo.

There is currently no way to revive and molecularly repair a frozen human brain. And such transplants haven’t even been attempted in animals. Thus, the surgical procedure is decades if not centuries away.