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Command, but the navy is telling nbc news that without conclusive visual evidence the multi-nation search had to continue. it is just one of several questions including the composite metal used on the craft that are being raised today as investigators try to piece together a timeline for the catastrophic end of the mission. nbc news has confirmed the coast guard is going to lead the investigation into the disaster aided by the ntsb. nbc's christen dahlgren joins us live from boston and oceanographer and deep sea explorer david gallow as well. christen, you have been there from the beginning. w...

Thank you for breaking that all down for us. joining us once again, someone with more than a professional interest in this search underway. water search expert david gallow, we should note, whose friend is aboard the "titan." i want to start on the noises. they were picked up by sonar. we were told they happened again today. so far they haven't yielded any leads we've heard from officials. do you see it as a hopeful sign? >> very much so. until we heard about these, or heard these noises, my optimism was taking a real dip. even after i was told there were these noises. we've had it in air fran...

Theseow depths, considering allf the underwater cables that do all of our communications and natural gas and oil and everythingtu else that we live n and communicate over, it's just extraordinary that we don't have that ability. also with us now is oceanographer and deep sea explorer david gallow, thank yog for joining us in this what seems like a forbodable. what are your conclusions? >> well, in a way, it's very close to all of us. you know, this solution was the simplest solution that we heard that they had lost contact, someone else said heard an implosion right around the same time, which...

Probably act as though that is the submarine. and start heading equipment in that direction and work on what are those sounds because time is getting short and they can't wait for an analysis to start moving. but, you know, i think that's issue number one right now, what are those sounds, and i wonder do they ping back from the surface to -- if that is the sub, to let the people in the sub know that we hear you, and we're doing everything we can. >> so, these five people are under water. i mean, 13,000 feet is where the "titanic" is, 12,500 feet. what is it like, and describe for us, david, yo...

And so it is cramped. it is just got to be absolutely horrible. i don't know any other way to put it. >> i understand you're friends with one of the passengers. >> yeah. p.h. nargeolet and i go way back. you couldn't ask for a nicer guy, more competent guy. in france, they call him mr. "titanic." he's the kind of person you would want to have in that situation because he's -- he's got a lot of wisdom, and knows his way around submarines and knows his way around "titanic." so, i can't imagine anyone better to be in a -- i wouldn't wish that on anybody -- but if i were in that situation, he's th...