jane addams. that stretch is a small one but it will be significant in that it will stick around for another 30 minutes. that is bound over to roselle. the green dots moving across the screen is traffic being censored. everything is moving through their trouble- free. volume must be light enough that it's not really impacting the flow yet. a few other hot spots in just a few minutes. >> are in a race against the clock, after search equipment detected two "pings' from what could be the missing malaysian jet. both of them were picked up back the frequency is identical to recorder. but there are two big problems. first, the black box from flight 370 will soon lose the last of its battery power. second, hearing a ping, and locating its source, are two different things. "unlike in air, where sound travels in a straight line, acoustic energy (sound) through the water is greatly affected by temperature, pressure, and salinity, and that has the effect of attenuating (bending), sometimes through 90- degrees, sound waves." while location of the wreckage is the ultimate key to understanding what happened to flight 370, investigators are still looking through