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But there's the possibility that perhaps the crew abandoned ship. there were life boats and life board and survival suits on board. the families are hoping they were able to get off that ship, survive the 40 to 50-foot waves as hurricane joaquin went by and there are search planes in a grid pattern looking for any survivors. >> nbc's christian dahlgren, thank you very much. we're also monitoring that news conference from the coast guard that's expected within the next ten minutes. we'll bring it to you when it happens. and also still ahead as we take a live look as they prepare for that news c...

They're using sonar that is made by your company. it's a different kind. but can you show what's this mapping looks like when they get that image back? can we go inside and look at that so we get an idea. >> first of all, they're building a -- we've already seen this mow the lawn pattern. that's what we've been doing here today. we have a grid pattern here. the boat is over here. we've been mowing along. and slowly building up a map of different things that are on the sea floor. this is what the mission planning they have done on the auv. but the data itself, this is what side-scan sonar data ...

It's very challenging. >> let's go inside. i want to take a look at how this looklooks. once the sonar is down there it has got to take some data back. >> the idea is to move the sensor back and forth in a regular grid pattern. we're moving along now. you see that we did one line previously. as you do you're building up a map of what's on the sea floor. we're seeing in realtime the auv. they only see it at the end of their mission. >> they are sort of flying blindly? >> in a way, yes. they will make their mission planning parameters based on general information. it may change the way they sear...

There's more to the sonar than in this whole process. that unmanned vehicle has to have navigation systems. all of those systems have to work together. >> so let's take a look and you get that data. in the process of what you get from the sonar. >> we have been mapping throughout the day here. they're going set up a grid pattern and they're going to move that grid pattern and that's what you see here. we're now at this point and building up additional mapping information. this is going to construct the map. we're going see this live. we have gps. they don't find this until the

That so far. and in any case, each detection sort of fills in a gap. fills in the box. and as they go back and forth in a very specific grid pattern they will start to build dots. and those dots will get tighter and tighter and you will get to a point where you can come to a very tight and close idea of where you would want to put that unmanned autonomous vehicle. and at that point you start to paint the ocean floor with sonar images. and if there is a wreckage there it will be quite obvious. >> now, miles what we see in australia is the larger map showing the search area, on the surface, the ...