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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 ...

And in this area, it was deeper. i mean, there are already some holes in their search. i mean, they cannot cover 100% with the bluefin. and the orion is a very competent tool. but without a map you don't know which one is the best equipment between the auv or the deep towing sonar. you know? because if it is very bumpy on the bottom you cannot choose a towing sonar. you will have a lot of gap area where the auv is better. but if it is pretty flat or if the towing sonar is very good, they should have a map first. we started with the map, and when we had the map we said okay, we can use this. we...

Entirely gets into it like a very soft mattress almost. you kind of fall into it and go away. >> you have experienced the -- many depths, and what do you see? are you seeing what he is seeing? the silt, do you think it will be covered? >> no, i don't think so. because there are currents, you cannot avoid the visibility, that happened very often on the titanic, some days we don't have good visibility but some days we have a good one. it it could be -- that thing can change very fast. >> and speaking of the titanic, you used sonar technology to help to find the technology, right? tell us about t...

Equipment now, most of the time we are using auv, on the air france flight we were using auv because the topography was better for towing sonar. but auv is a carrier, also, the so sonar, the same kind of equipment. that is the only way to see something under water because you don't care about the light, if it is dark or not with the sonar. you don't need any light. and you have the swab, which could be pretty big, much bigger than the towing sonar, the auv, more power, the battery cannot give the same power than you can get from a surface ship. and that is different. erik do you think they sho...