is getting down here to use what is called synthetic appature sonar. the big question is what is happening up on the surface. rough waters may get hard to deploy, hard to recover. they want to do a lot of mapping up there like with the "hms echo" to figure out what they are dealing with before they throw the expensive robots into the water to start searching. >> tom foreman, thank you so much. let's bring in our panel. jacque is a maritime explorer and miles o'brien is a correspondent for pbs news hoho. let's talk about the type of equipment that is on the echo