“you will see that it’s designed to be impregnable even to an attempt by military forces to enter it, as to rescue a national figure from American custody.”
Every impregnable thing ever built has eventually been impregnated. Someday, someone, somehow... and the world will be astonished.
True, but there's a time factor. As long as the United States military is functional, ADX will hold off a rescue squad long enough for the cavalry to get there.
“Fixed fortifications are monuments to the stupidity of man. If mountain ranges and oceans can be overcome, then anything built by man can be overcome.” Gen George S.Patton