I am confused about whether or not the tunnel between T6 and T5 is permanently open. Some posts keep saying IF it is open. I am flying into T6 in January on DL commuter from SLC and then have to transfer to DL SYD flight in T5. I am assuming that if the tunnel is open I can just walk through the tunnel with my carry-on (no checked baggage) and avoid TSA. If it is not open do I have to go through TSA again? I have about two hours for the connection.