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Pressure reading. so it's either going to be a huge success or it could be a real disaster. >> bret: steve, as a.b. said, the administration, the president seem to learn from the initial effort when thad allen came out and said they thought that this had stop and they were successful with the first top hat. it's not the case now. they are waiting to see how this is going. >> yeah. and they're smart to do that for the reasons that charles points to. we all know that if they want to take credit, if they want to go and claim the credit, they can do it in three days and it will have the same impac...

Restrict the flow that. will make sure we don't do anything prematurely if we're getting variations of the pressure reading but it will tell us about the the fellow, the empirical data. jon: all right. do you think you've got a challenging job? for the last 85 days, more or less, that man, admiral thad allen of the u.s. coast guard has been in charge of trying to cap the leak, that leaking oil well at the bottom of the gulf of mexico. he says that they have lowered that new cap, and the latest attempt to cap the gusher, too soon to tell whether it's going to work. there are tremendous pressure...

If the pressure is low at the top of the well, does that indicate that oil is flowing out through some other point of the well and, if so, what are the theories on where it is escaping? >> that's exactly what we are going to try to determine from the pressure. one could make the case that there is something, there's some structural integrity issues with the casing and the well board itself. i don't think we know that until we take the pressure readings and see where that information takes us. it is unknown what happened to that well board at the time of the exmroegplosion and the even that imm...

Anne thompson is nbc's chief environmental affairs correspondent and maybe no longer a permanent resident of venice, louisiana. they will be giving you voting rights by november, and you may get a tax bill. >> you know they're going to make me pay taxes. >> absolutely. okay, ann. where are we? we know they're in this testing phase to see if sealing this off is a permanent solution, i say permanent, the solution and until the relief well goes down. where do things stand? >> reporter: well, right now, national incident commander retired admiral thad allen just gave a briefing, chuck. and he esse...

That will controlled by a remotely operated vehicle which will slowly close it incrementally. this is very, very important because we want to measure the amount of closure radially by turns of that choke line valve by an rov simultaneously taking pressure reading. the goal is to slowly dlees down and understand the changes in pressure as we are closing it until that choke line is closed. at that point, there will be no hydrocarbons exiting from the capping stack and we'll go into a period where we will start taking pressure readings. it will go in basically 6, 24 and 48 hour increments dependi...