self-explanatory, and place that over the leak with the same purpose, to siphon the oil up to the surface. another idea they were talking about a couple days ago, something they refer to as just -- basically they would be blasting a great deal of rubber made from tires, even golf balls, to try to seal the leak. then they would use a compress of mud and concrete to seal things off. they're certainly hoping one of these will work. right now the one they're really pushing for is, of course, just that six-inch pipe and trying to bring it to the surface. >> and these chemical dispersants, the chemicals they're talking about using, a lot of environmentalists are really raising red flags saying wait a second, these aren't testing, they mighting da dangerous. >> is there any discussion about whether they are dangerous? >> reporter: the last thing they want to do is make a bad situation even worse. that's the key plan for this. there are a lot of people that