weaker and weaker. obviously, then, if you add in wave movement and you add in extraneous circumstances, then that might give the appearance or the effect of it cutting in and out. >> all right, richard, thanks. mary ellen o'toole and mary schiavo, thank you for joining the conversation this morning. we'll continue to talk throughout the day. all morning as we have been talking about the device that the chinese used, they say it enabled them to hear the pulse signals. something, if you look at it, really does not appear to be too sophisticated. >> clearly this hydrophone does not go as deep as the towed pinger. >> we'll take a closer look at this sonar, next. i take prilosec otc each morning for my frequent heartburn. because you can't beat zero heartburn. woo hoo!