They do have a huge salt dome here is mississippi not far from where I live and they did nuclear testing in it during 1964..

[link to en.wikipedia.org]

Salmon Site is a 1,470-acre (5.9 km2) tract of land in Lamar County, Mississippi, near Baxterville. The tract is located over a geological formation known as the Tatum Salt Dome and is the location of the only nuclear weapons test detonations known to have been performed in the eastern United States.

Two underground detonations, a joint effort of the US Atomic Energy Commission and the US Department of Defense, took place under the designation of Project Dribble, part of a larger program known as Vela Uniform (aimed at assessing remote detonation detection capabilities). The first test, known as the Salmon Event, took place on October 22, 1964. It involved detonation of a 5.3 kiloton device at a depth of 2,700 feet (820 m). The second test, known as the Sterling Event, took place on December 3, 1966 and involved detonation of a 380 ton device suspended in the cavity left by the previous test. Further non-nuclear explosive tests were later conducted in the remaining cavity as part of the related Project Miracle Play.


[link to mshistory.k12.ms.us]

found this article as well they planned to use the mississippi salt dome as storage too

[link to www.duke-energy.com]

HOUSTON – Duke Energy today announced plans to convert an underground salt dome in Copiah County, Miss., into a natural gas storage facility with 3 billion cubic feet (Bcf) of initial storage capacity. The dome can accommodate an additional 6 Bcf of storage capacity.

As early as spring 2004, the new facility could begin providing rapid response fuel storage services for delivery into nearby pipeline systems and provide "moment’s notice" services that are expected to appeal to natural gas-fueled power generation stations.


Hmmmm......

check this site out the Louisiana sinkhole bugle

[link to lasinkhole.wordpress.com]