Containers as Projectiles (IMAGE) Princeton University, Engineering School Caption Tractor-trailor containers became projectiles during Hurricane Katrina storm surges. These pre-stressed concrete posts toppled like dominoes when struck by the containers, even though they had been driven into the ground to support the floor of a warehouse that was under construction. Credit Princeton University School of Engineering and Applied Science Usage Restrictions Please give appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.