my brother works for shell oil company. he told me that its looking like the BOP (blow out preventer) FAILED to close, from word he heard.(MMS is suppose to inspect BOP’s.(minerals management ser.-(the gov.). he also said the secrect service agents and obozo’s cabinet staff were at the robert training facility in robert, louisiana on thursday..
http://www.shell.us/home/content/usa/aboutshell/shell_businesses/upstream/roberts_training/about/
rigs will explode if the mud weight is to light and high pressure gas will force the mud up if to light.. the explosion is caused by high pressure natural gas mixed with oil
http://www.youtube.com/watch?v=5IsmHp3iPfw
Or if, as I suspect happened in this case, the well starts swallowing the weight material (mud) in the well bore and whoever is supposed to be watching that isn't for some reason!