This shelter picture was taken directly from the FEMA P-320, Fourth Edition/December 2014 and shows a "site-built safe room that withstood the impact of the Moore tornado (Moore, OK, 2013)." The FEMA P-320 is guidance provided by FEMA for safe rooms. Before we dropped a 3,900 pound van from 50 feet onto our shelter, Caleb Holt, PDC Manager for Texas A&M Engineering Extension Service, stated, “with the gravity pull, essentially you’re going to get 195,000 foot-pounds directly impacting this (shelter) and if you calculate that out and think about the fastest wind speed ever recorded in North America, 318 mph, this is going to be in the neighborhood of 1,200 mph.” That’s equivalent to almost 4 EF5 tornadoes bearing down on the shelter at one time!