Question: Before I claim this as a continuity or factual mistake - a question: When the Arab raiding party shows up over the dune, they camp by a collection of scrub that was not all dead, some was green. There were also a number of plants in that low-lying area around the camp. Wouldn't the survivors had a better chance of surviving more days by digging for underground water in that area? Perhaps deep, but there. If they took 12 days to build the plane, it seems 2 days digging for water would have given them more time.
kaevanoff
1st Sep 2020
Answer: In the desert, the only place you can find water as at an oasis or maybe digging in a dry river bed. Those bushes would be extremely salty, and any meaningful water would be far too deep under the sand.
stiiggy