passengers, the oxygen only lasts 15 minutes, whereas the crew has 45 minutes up to an hour and a half depending on where they were having an emergency. so they could have been cognizant. >> and let's move to the area of the next closer ping. and it will just expand exponential going forward? or do they need different assets? >> i hope that hms echo finishes the map and they have a good map. because that is something very important. with a good map you can decide which equipment you are going to use. because this is pretty flat or pretty good area, i would say the towing sonar could be better than bluefin, even if the bluefin has a sonar, too. but it will be probably more efficient, it can do it faster, a bigger area. >> there are pluses and minuses