i'm not sure how this makes sense. the whole point of scorched earth is to create exactly this kind of cost and requirement for work.
i'm also pretty sure it would be more heroic if it wasn't that this whole operation was paid for. its not people doing something nice off their own backs... its people doing their jobs - however heroic or awesome it is to behold from the outside, they are doing what they need to do and what they were trained to do in order to collect their paycheques.
you might think its amazing that they didn't quit, but I'd hazard a guess that these guys knew at least a bit what they were getting themselves in for and were being suitably compensated for the extra difficulties of the job.
... still the photos are very thought provoking.