sonars out there. and so if somebody is testing one of those, and turns it on for a short period of time, you would get a number of pings separated by a second. we need to know more about the signal, and then the search group in perth can figure out what to do with it. >> and also, people should know that there is a lot of ship traffic, and sea life in the southern indian ocean, and does it impact the ability to hear the pings? >> 37.5 kilohertz is a pretty frequency that is pretty clear in the ocean spectrum, however, there are dolphins that can make clicking sounds, and i believe 37.5 kilohertz is one of their frequencies, also, so perhaps the people at scripps ought to tell us about the sounds that dolphins can make. >> yes. and tell us about the equipment that is needed to hear the ping