MSM Coverup? Why isn't this on National News?

This has been going on since August, and only getting worse by the day:

Huge sinkhole causes mass evacuation in Louisiana:
http://rt.com/usa/news/sinkhole-mass-evacuation-louisiana-684/

A potentially explosive and radioactive sinkhole near Assumption Parish, Louisiana has led local authorities to order a mass evacuation.
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Sinkhole dangerously elevated, possibly flammable hydrocarbons
http://www.examiner.com/article/sinkhole-dangerously-elevated-possibly-flammable-hydrocarbons
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Of great concern among sinkhole area locals are the possibilities of an explosion and an uncontrollable fire from the methane gas and other hydrocarbons in the area, on the bayous, in-home and at the sinkhole site.
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