I have been in this part of Southern Arizona. This not a place to be when things go wrong. While the heat does not approach the levels of the desert outside of Phoenix (lower elevation), it is still blistering. The good thing is (I guess) the possiblity they were taken out by "interlopers" is very slim due to the proximity of Fort Huachuca. These guys remind me of the dopes in northern Maine that have gotten lost and rescused eight times in the Allagash. The same thing has happened in Alaska numerous times. Some people never learn until their light slowly dims out of existence. I hope these guys in Arizona are not extinguished; but the odds are slim. Heat, rattlesnakes, and very rugged terrain (caves) do not add up to a good outcome.