I am afraid that is not at all true. The only reference ever found was the article in April of 1919. It was reported by David Hatcher Childress (Ancient Aliens fame and many books) in his series of his travel books one of which was entitled "Lost Cities of North and Central America" 1992 image shown. (Great reading by the way !)

[i.imgur.com]

In it he relates how he wrote to The Smithsonian and inquired about this article and they denied all of it. I then decided to do a web page on this and in 1999 it was the only reference to the lost caves and the article quoted. My web page has been copied many, many times and most present articles were copied from my original. Ancient American magazine made all kinds of grand claims about finding them but in the end never presented one shred of evidence.

However the fact that certain area of The Grand Canyon are off limits to hikers and campers because of "dangerous conditions" was never answered as I too wrote the Smithsonian and actually got a response where they basically accused the article of being an April Fool's joke.

The video is a complete fabrication. I am amazed that people are so willing to believe this stuff without doing their own research.

Below is an image of my former website which I still have but am no longer streaming. I built it in the year 1999-2000 along with a website on Tesla being erased at The Smithsonian.

[i.imgur.com]

And a link to Internet archive and my original site from 1999

[i.imgur.com]

Here is the YouTube video that I was referring to. It is a plain lie.

[youtu.be]

regards
db

See I can be on the "other side" too.

"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db