Just mapping is not enough, probably have a massive sonar array. Think we are not mapped already? Some have mentioned Google Earth Images and Microsoft Earth Images. Not to mention all the cheap and expensive drones, cameras and other items purchased by us from china. They have probably more complete maps of our land, lakes, rivers and seas than we do, not to mention all the infrastructure that is controlled by chinese electronics. Tic Tock was the diversion from what is actually happening. Oh well, I will admit I am a bit paranoid.