What a shame. I feel bad for their families. It will be interesting to hear more details as they come out and ponder what they could have done differently, or ratyer what we think we would do differently.'A ravine with steep terrain in a desert that big could be dangerous any time, day or night. It obviously wasn't easy to find them even though the searches knew their last know location and their intended destination. A PLB and/or cel phone may have helped but we don't have enough details to kow yet.