unusual that you would kind of guess, put your finger in the air and say i will search here and you get pings. so i'm a little suspicious that it was just a lucky break. i think there is science behind it. >> ah. >> there you go. from the professional, the woman who knows who has investigated many of these. i think you said something very interesting here, paul. mary did. there is the big gun that has the towed one and then are there are smaller units out there. richard raised the question. would you be using the little headphones and sticking the thing right there? >> i would think i would want to use the most powerful, most sensitive, most selective. >> equipment. >> receiver they could get my hands on. >> yeah. >> and then track back and forth. make a chart of the received signal. the problem is we don't have that luxury given the batteries about to be depleted. >> we're getting close to the top of the hour. you're right.