>> absolutely, it will be another brick, if you will, that will help you determine where the plane was at its final resting place. every time they get another ping that was hugely beneficial. that is why angus houston said you don't get any second chances, he is going to be absolutely certain that the batteries were dead. >> and he estimated maybe a day or two more of listening for ping sounds before they give up on that and go under water. i wonder if they would extend that if they get a fifth ping. >> i think if they have any reasonable expectation that those batteries are still good and the pingers are still pinging, they will continue to do what they are doing. you know, aviation is all about extra margin, so when a company says 30 days of extra battery