The article mentions that the sand doesn't require a lot of water. Check out the picture with the guy standing on the sleigh pouring water: http://www.washingto

The article mentions that the sand doesn't require a lot of water. Check out the picture with the guy standing on the sleigh pouring water: http://www.washingtonpost.com/news/morning-mix/wp-content/uploads/sites/21/2014/05/EgyptianPRL-1.jpg http://www.washingtonpost.com/news/morning-mix/wp-content/up... They could probably load up an empty sleigh with water and then drag it to the rocks.