>> audio archaeologist. because i dig very low sounds out of noisy situations. like restaurant noise or sometimes cockpit audio. >> so what do you do, try to figure out who -- just anything -- whose voice it is? what the sound is? >> sometimes. sometimes i want to have a pertinent conversation that happens to be, say, evidence of a crime in a criminal case. and not be listening to everything else that's happening in the restaurant. so my job is to pinpoint or -- >> so i said what else could it be? some people said it could be sea life. you said it could be sea life but -- >> well, no. i said there are so many characteristics that a pulse from one of these pingers would have that if it -- if you heard something and detected something that had all of these ar characteristics, then i would say that is what you're dealing