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Video, there is a lot of white material coming out of the end of the pipe. and that is the gas. in fact, you can see it float upwards in the video. quite a bit more rapidly than the oil does. >> jeff: and then it turns dark. >> right. and that's the oil. toward the end of the video. i based my analysis -- yeah, go ahead. >> well, i mean, as another engineer, you trace a particle, then, and you have software that measures how fast it's going? >> exactly. the name of the technique is called particle image velasymmetry, and basically that means measuring the velocity of the fluid based on a parti...

That's a huge discrepancy. so are you suggesting that they don't know what they're doing? or you have two very different opinions? or maybe they're not being as forthcoming for obvious reasons? >> well, i have seen the description of bp's number. and their methodology isn't clear. so i can't really say one way or the other that their number is wrong. but i can say -- one thing that i can say for sure, i'm looking at a snapshot in time. this 30-second snapshot of this video that they posted. and during that 30-second time period, i see a flow rate of 70,000 barrels a day. plus or minus 14. so i...

Are you surprised that there could be such a debate on something that you would think -- me as a layperson would think there are probably a lot of experts that can look at that and say it's roughly this, and they would all be fairly close. 5,000, 70,000, miles apart. >> it somewhat depends on the amount of oil versus gas that is in the mix. if you're counting crude oil that actually surfaces, you won't see the gas once it dissipates into the water. it eventually surfaces into the atmosphere. but that much crude oil, there shouldn't be that kind of discrepancy. something is missing here, and i ...

Earlier. >> yeah, exactly. but these systems in oil wells are really not fail-safe. if things go wrong, you can turn them off. there are systems to shut a valve, a big valve. even if the drill stream is solid steel rod is still in there, it will cut through it and shut it off. but you have to activate it. you have to turn it on to do that. it doesn't happen on its own. and so it's not -- >> jeff: so it's not like a train where if the conductor goes down, everything shuts down. >> the dead man pedal. in this case, in congressional testimony they said if the battery is dead, the dead man pedal, ...

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