An overly ambitious jump from the sand dune above? The abandonment of a stolen bike? The crew ran out of fuel and bailed out on their way back to base? We may never know.
The rear wheel looks in good condition but the front wheel is gone and the chain is completely trashed. Oh, and I wouldn't want to try sitting on the seat.
I suspect that it's next resting place is the scrap yard unless someone comes along to scavenge it.