latest state of the art integrated navigation systems, which are absolutely incredible, in addition to all the various redundencies and alerts that you would expect should a failure occur.
Until the tea lady trips over the cable and yanks the plug out of the wall.
All our radar data, R/T and telephone wires were triplicated; however they all came together at the point where they entered the building. All it took was a navvy with a JCB ......
Same principal. As soon as you develop a fool-proof system someone develops a better fool