He contends that creating a perfectly safe superintelligent AI is impossible because it is equivalent to the impossible task of creating a perpetual safety machine.

“the problem of controlling AI or super intelligence in my opinion is like a problem of creating a Perpetual safety Machine by analogy with perpetual motion machine is impossible”

International cooperation and supervised containment of AI development are necessary to prevent global existential catastrophe.

“we are putting the chips that can be used to build the more powerful AIs into locations where they where their uses are supervised.”