TEST
If there are Chinese Troops,
I bet there should be also Chinese Subs and secret drone bases.
Chinese might take advantage of the cave networks to storm the Home Land.
DemocRat cities seems to be strategically positioned for this.
https://madison.com/wsj/news/local/govt-and-politics/search-continues-for-pilot-of-madison-based-f-16-jet-that-crashed-in-michigans-upper/article_aee8350b-4d36-5dc7-ab27-c421e3936116.html
https://usnhistory.navylive.dodlive.mil/2017/06/26/uc-97-forgotten-wwi-history-in-an-unexpected-place-lake-michigan/
https://northernwilds.com/submarines-in-lake-superior-or-the-great-lakes/
https://hinton-b6049.quicklane.ca/news/nazi-u-boat-from-battle-of-niagara-falls-found-in-great-lakes
The military, law enforcement and search-and-rescue teams have different missions but face a common problem: operating underground. The Defense Advanced Research Projects Agency, better known as DARPA, is about to kick off a competition aimed at furthering robotics technology to help them do their jobs.
The subterranean operating environment is multifaceted. For example, militant groups like the Islamic State and Hamas have built extensive networks of underground passageways to move fighters and protect themselves from aerial attack. Drug cartels are using tunnels to smuggle contraband into the United States from Mexico. A former Thai navy SEAL died last year while trying to deliver oxygen tanks to kids trapped inside a cave.
Meanwhile, top defense officials believe the U.S. military will have to do battle in megacities and other urban areas that have complex underground facilities such as subway systems.
“Subterrain is just going to be something that we have to contend” with, said Army Lt. Gen. Robert Ashley Jr., director of the Defense Intelligence Agency. “That will be part of the warfighting in the future.”
https://www.nationaldefensemagazine.org/articles/2019/7/29/darpa-subterranean-challenge
https://www.popsci.com/pentagon-wants-technology-to-fight-wars-in-big-cities-and-underground/
https://www.militarytimes.com/news/your-army/2019/02/26/the-subterranean-battlefield-warfare-is-going-underground-into-dark-tight-spaces/