I'm afraid that there's almost no hope, not with the kind of temperatures JT has seen of late. I was out in relatively mild heat ( 101F or so ) this weekend and had a dehydration headache and mild mental fuzziness after a mere 3 hours - starting out from being hydrated enough that my pee was crystal clear. In average conditions 3 days is about as long as a person can survive without water. There's a bit of hope for water - monsoon rains in the Park in recent days. From an article ( http://www.hidesertstar.com/news/articl ... 967e7.html ): "The searchers are also coping with changing park terrain thanks to the monsoonal rains in the past month. The storm that hit some parts of Joshua Tree and Twentynine Palms Saturday night did not fall in the search area, but Messaros said they hope some water might get to Nguyen and Orbeso. “We’re hearing from the teams that there is water up in the rocks, so what we’re hoping is they’re able to find some water and shade,” he said."
They may have managed to escape the worst heat by taking refuge in a rock pile, of which there are many in that area of the Park. Large rock piles can create microclimates tens or more degrees cooler than the surrounding area ( I know this from experience ) and that might be enough, for a while. Also - I have found water in the most random places in JT. More than once, in the form of a cache placed by rock climbers or hikers. So, possibly ...
According to this article ( http://www.hidesertstar.com/news/articl ... 5cac2.html ) they are supposedly fit and athletic, so I would guess that they are much further away from the trailhead than would seem reasonable, and may possibly be prepared to survive for longer than typical day hikers would. That article states footprints in a canyon "north" of where their vehicle was found. Assuming the vehicle was parked at the Maze trailhead I'd think they might have headed into this wash: 34.084597, -116.241743. There's some scrambling waiting in that wash based on a quick look at the satellite view, but it seems passable if you know some cross-country tricks for navigating rough spots. It's about 2 miles in a straight line out of the Park. From my own experience in the Park: I've gone down washes where a bad choice scrambling down a rock, or even just a slip and fall, would have trapped me in a 8-foot deep, 10 foot wide hole between boulders with no way out. Whenever I encounter a trap like that I pucker up a bit and my heart flutters. You have to respect the terrain out there, and be really, really deliberate and careful in what you do, and more than willing to turn around if you have even a whisper of a misgiving. I have done that more times than I have proceeded.
Regarding that cell ping, from the first article I linked: "A ping of Orbeso’s cellphone was recorded at 4 p.m. Thursday from inside the park. Messarsos said the ping came from the general area where the couple’s car was parked, so it was of limited use to the search." Spitballing a 4pm ping from the vicinity of their car: maybe they planned to hike up a nearby peak to view the sun set from up high. The peak in the area 34.0887, -116.2405 seems from Google Earth to have local prominence and might have been a target. That would gel with the footprints found leading north.
Of course, it is easy to come up with wild theories from a chair and a quick glance at Google Earth. My opinion isn't worth the electricity taken to transmit it to your screens.
The Joshua Tree S&R group has this picture on their FB page that appears to show some tracks from the aerial search: https://www.facebook.com/josarorg/photo ... =3&theater
Heat seeking instruments is a fantastic way to find a live body in rough terrain. I'm not sure how effective it would be when the ambient temperature is close to body temperature, though. I'd love to know more about that. Granite rocks, for example, holds on to daytime heat for a while.
I agree that it seems like drones would be an ideal search aid in these cases.
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A Resqlink costs $250. I carry mine whenever I enter the wilderness. I am not a fool and I know it isn't foolproof ( as an example - if I fell into one of those 8 by 10 coffins I mentioned earlier, the odds of it picking up a satellite through a 10x10 ceiling window to the sky is basically nil, so I'd be screwed ), so I do not take any risks just because I'm carrying it. I'm not of the "idiots think their Spot will always save them" mindset. But just in case I suffer a lapse in judgement or bad luck, I like to have at least one Hail Mary to throw.
