ITS QUITE SIMPLE FOLKS - THESE SOUNDS ARE GENERATED BY UNDER GROUND TUNNELING.

THE EXPLOSIONS ARE DETONATIONS TO BREAK THROUGH SOLID GEOLOGICAL ROCK FORMATIONS AND BEDROCK. THE SHAKING AND TREMBLING ARE THE TUNNELING MACHINES THAT ARE GRINDING THROUGH THE ROCK..

BENEATH THE SURFACE ARE HIGH SPEED TRANSPORT LINKS AND NETWORKS - AND THESE ARE JUST NEW AND IMPROVED UNDERGROUND BASES WHICH ARE INTERCONNECTED BY SUPERSONIC TRANSPORT NETWORKS THAT ARE DESIGNED TO TRAVELING IN A VACUUM OF AIR WITH NO RESISTANCE.

THEY HAVE BEEN AROUND SINCE THE 50S - BUT NOW THEY ARE BEING CREATED AT AN EXPONENTIAL RATE.