plausible and happens quite often. the vehicle has a variety of limits that it monitors, one is the maximum depth that it's programmed to go to, which may be shallower than its maximum operating range, depending where you're operating, and it does fly a certain height above the bottom to enable the sonars. >> if this doesn't work, what's the next step? is there a next step? is there something else? >> i think one of the things you could do is bring in a deep tow side scan sonar, potentially one with a lower frequency. my understanding is the system installed right now is operating somewhere above 100 kilohearth z. there are other systems available that would allow you to search a much wider area in a shorter amount of time, which, of course, is something that you want to do when you're doing a wide area search. now, those systems are generally deep tow systems because they are going to be larger and may not be capable of being