To be honest, I doubt there is a "not in the loop" person out there, who knows the exact mechanism of the arrival of mud. We clearly have multiple theories which provide possible explanations of why lower floors of the 19th, and early 20th century buildings ended up buried under up to 20 feet of mud. Whether it was a single catastrophic event, or a combination of several different ones remains to be seen. In reality, we do not even know if it was an artificially created, or a 100% natural...

Mud Flood in Chattanooga, TN and Leavenworth, KS. Underground Cities and Tours.