An 8-foot, high-security, steel fence, with a K rating that indicates it can stop a 15,000-pound truck going 40 miles per hour. The fence helps make sure there is only one easy way to get to Joe’s building, which is by staying on the road around it until you get to the gatehouse. A 3-foot deep, foot-and-half-wide trench has been dug all the way around the boundary, then filled with concrete. The main posts, about 10 feet apart, are set in four feet of concrete.”]
Source: https://www.csoonline.com/article/2122903/high-security-perimeter-fence.html