Dropping this possible lead here about Hawaii... not evidence or proof but certainly something to think about.

A friend once went to discuss possible rental of one of the buildings for a small business in the "down town" area of honolulu also known as "Chinatown" near the Honolulu community college. The elevator man took him down an old fashioned elevator to survey the property. (Who even has an elevator man in Hawaii?) It gets weirder.

There in the "basement" were hallways going as far as the eye could see, with many rooms connected along the way.

"Where do these hallways lead to?" asked friend.

"You didn't know? This entire area is connected underground. But no one has used these pathways since the 1800's"

"This entire area? You mean like this block of buildings that I would be sharing this basement with?"

"All of Chinatown. The entire downtown area is connected underground."

Yeah, there's a catacombs underneathe Down Town Honolulu.

Now let me tell you this, I grew up and lived my entire life there and have never once heard of this from any source. But I have heard stories from people who were around in the 50's and 60's of literal shootouts taking place in down town between rival gangs and police. This place is certainly run by drug cartels, maybe not as powerful as the Italian Mafia but certainly some badass mofos you don't really want to mention in public. Where were these gangs residing? In apartments? I doubt it. There is a possibility that the downtown underground has been used for trafficking drugs and even children for a long time.

Maybe someone interested can do some searches for the buildings at or around the place and find any links or suspicious logos...