Owen suggested that I elaborate on my suggestion for the use of magnesium cement in conjunction with basalt woven mats to create nearly instantaneous shelter. This idea stems from the work done by Michael Collins using magnesium cement (sometimes called “Ceramicrete”) in combination with other fibers, such as burlap or canvas. You can read a lengthy post I wrote about this several years ago at www.naturalbuildingblog.com/magnesium-cement-for-roofs-and-plaster/ . It would seem to me that using the basalt material, which is so incredibly strong, and stiffening and waterproofing it with a bit of the magnesium cement, has some very interesting potential. This is only conjecture though, since as far as I know it hasn’t been tried.