monkey wrote
"It's really not rocket science to prevent objects as large as cows from entering the airport environment.2
yeah but as your post re Biak points out this is Indonesia- all that lovely grass going free and hardly anything happens all day so of course any decent farmer is going to let his cows roam - and since he's probably related to the guys who run the airport who will stop him?
TBh they don't really need the tunnel at LHR - just let people zoom across 27N in between the flights - there's about 45 seconds each time after all