tornado's

After designing our bus shelter, We were asked to think of a natural disasters and come up with a shelter that would protect from the natural disaster. We reasearched different natural disadters, as we looked through Youtube there was a video that really influences us to design for tornado's. http://www.youtube.com/watch?v=_SnTlC_PpPY. We did researched and realized that dome structures are the most dependable against tornado's because the wind curves to the sides and not over the structure. This research really influenced our design, The reason why the actual structure is underground is for more protection.