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, the dead man system doesn't work. it's not quite the same. >> jeff: steve, you're a flow measurement expert. we've been talking about it. everybody is talking about it. what is your take on how much oil is actually leaking out? >> well, so when the video was released two days ago of the oil and gas poring forth from the pipe in the bottom of the gulf, i tried my advanced analysis techniques on it. a technique called particle image velasymmetry. and i was able to calculate 70,000 barrels a day are leaking into the gulf. >> jeff: so steve, obviously bp now says 5,000.