Here is an article from The Advocate with Gary Hecox's explanation of what they believe is occuring:
[link to theadvocate.com
From the article (less than 50%):
Shaw geologist Gary Hecox explained to more than 100 residents during a community meeting in St. Joseph the Worker Catholic Church hall in Pierre Part how a breach in the side wall of the cavern inside the Napoleonville Dome allowed sediments into the cavern.
The solid salt dome is a 1-by-3-mile salt deposit formed from the evaporation of ancient seas in areas now covered by thousands of feet of sediment.
We have a serious problem, here. It sounds as if they are now admitting that the Napoleonville Dome has been compromised. Am I reading this wrong?
They are admitting now that this situation is unprecedented! They do not know how to fix it.
I personally think we will see a slow moving collapse, up to a point, then all hell will break loose. I think we will see extreme water table contamination, before we see large ground collapse. I am sure they have done underground mapping and are quite aware of the extent of damage that has been done to the salt dome complex. Keep in mine, everyone, that this is not just a localized problem, Salt domes are interconnected (for the most part) and this salt bed extends from the coastal region of Texas, all the way to the coast of Alabama.
God help us all...