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David gallo, and david souci, david, the silt that is supposedly underneath here will that interrupt the side sonar scanner? >> i don't think silt will be a problem. we always have to worry a bit about sediment kicking up. it would happen certainly not to the level it would impact the sonar search -- >> and the environment, we talked about this a little during the break. the environment at these kind of depths under the water, it is a whole other world. >> it is a completely different world that nobody has a concept of. 50% of the ocean is above that. >> you see species down there you don't se...

>> it is density, water moves because it is dense, if it is salty or cold, the water is actually water that cuts across the sea bed. >> of water that is more dense? >> yeah, it floats, it started to use the antarctic and pours into the basins, the lakings are own more amazing that you can go to the bottom of the ocean and see what looks like a lake at night. >> would it interfere with the towed pinger locators? >> potentially it could, it makes a little bit of extra noise, there are some that are in that frequency range. there is the physical movement of the propeller and pieces on it that can...