and the search for debris. the pings we think we know it is there. there's something there that's pinging and we believe that it's the plane. as opposed to the wreckage, where we found a lot of places where it isn't. so i think the ping, clearly the best. you know, i don't want to be too much of a pessimist, but that's all they've got right now. the bluefin will help them have more information about their only clue. but there's a lot of riding on those four pings. >> and the one thing we know for sure, you can't be looking for quick answers. that's not the bluefin works. it's a 24-hour cycle every time it goes down. four dauers down. does its surveillance. they have to download the data. it's going to take time. two liters of fluid being found from this oil spill nearby. you say that's a big number, david? >> it is. you would think it would be more disbursed than that. unless they have some way of gathering it from a large area. the fact that they were able to