From the wiki source, my inference is that the tunnel is at least 4 inches long if he was able to line it with 4x4 boards... But aren't 4x4 boards typically cal

From the wiki source, my inference is that the tunnel is at least 4 inches long if he was able to line it with 4x4 boards... But aren't 4x4 boards typically called "posts"? I'm amused by how poorly Time reported this.