So, they are hibernating or balancing on the verge of death. Big deal. Look at what e.g. deep divers can do. That’s not mind over matter, just utilizing functions of body to the max. Provided, those stories are not just one huge BS, which is very likely, especially if they are Tibetan Buddhists or Buryats. Still, even if true, for all practical purposes those monks are as if dead. And in the end, they will die for real nevertheless. No doubt. Just in their case, probably later than sooner. As for Tiller and Radin, just lol. But to each their own ;)