Underground Oklahoma City?!

I love stories about paved over streets (underground Atlanta) and other underground larbyrinths...

Here is a story of one under Oklahoma city...from Dustbury Blog...

LINK

No one knows for sure, but the first Chinese immigrant probably came to Oklahoma City with the construction of the railroad or at the time of the Land Run. We do know that when the first city directory was published in 1890, there were five Chinese listed (Sam Chong, Hong Kee, Ming Lee, Sing Lee, and Wah Hop). These enterprising men most likely had come to the United States before the Exclusion Act and had been able to secure resident status. It is safe to assume that there were more than just these five Chinese in the city. However, later census records for 1900, 1910, and 1920 consistently list only a handful of Chinese in Oklahoma City.
As important as the Shirk expedition was, its discovery merely serves to confirm for later generations that such a place existed - it was unable to really illustrate for us what life was like inside the subterranean town. Few non-Chinese ever ventured into the catacombs, but we do have some records of people who did. In 1921 the Oklahoma Department of Health began a campaign to improve sanitation and living conditions in the state´s boarding houses, restaurants, grocery stores and the like. So in January, state health inspectors swarmed over eighty locations in Oklahoma City - six inspectors and one sheriff went underground. The inspectors were doubly amazed when they entered the subterranean village via a blue door in the alley off Robinson between Grand (Sheridan) and California - they did not expect the underground area to be so extensive nor did they expect it to be so clean.

And you thought Okies were merely cowboys and Indians...