investigations unit uncovers his ties to the oil industry. we want to welcome our viewer ins the united states and around the world. i'm wolf blitzer, and you are in i'm wolf blitzer, and you are in "the situation room." -- captions by vitac -- www.vitac.com scientists are warning of an invisible threat from the oil disaster, methane gas. it is a threat that has a potential to kill sea life on a massive scale creating vast dead zones in the gulf of mexico. one oceanographer says that the oil from the leaking well contains up to eight times as much methane as typical oil deposits, and that is raising serious new concerns. over to the professor of environmental sciences at louisiana state university is now joining us live. professor, how big of a deal is this? because some scientists say it is a real concern for the environment in the gulf of mexico. >> well, wolf, i think it is a concern. but there is just an awful, awful lot of water out there. i did some quick calculations, and you just take a square mile