Coffee!!!!!
"Infra-sound is disrupted by certain rock formations, this causes navigational disruption..."
Oh..,not Dark's Coffee then..Hurumpf.
The British Western Front in France: Tanks kept in touch with the infantry by carrier pigeons which were released and carried messages back. During the First World War, Allied birds outperformed their rivals and saved thousands of livesall thanks to the efforts of one London pigeon fancier.