robert mester. what do we know about what they're doing now? what does this effort look like?reporter: right, and we're learning more about that today. the u.s. coast guard is going to be taking the lead in the investigation we just learned today, and they've also asked the ntsb for help as well, so a u.s.-led effort. currently those rovs that were searching the bottom for any signs of submersible continue to comb through that debris field running patterns, trying to see what other pieces it can locate. there are still some questions that i'm curious to hear what robert has to say about this about what they're going to be able to potentially bring up to the surface, what the capability is from those rovs to recover pieces. they'll of course be looking for pieces of that carbon fiber shell that is now suspected to have played a role. but still, a lot of questions as this investigation continues. >> i'll pick up that question kristen was asking about the difficulty and the capability of getting some of that stuff off of the ocean floor. we heard yesterday about the five major pi

. >> yeah, robert mester, bifacial your expertise, thank you so much. >> okay. >> joining me now to discussard, florida international university professor it retired navy physician, dr. aileen marty. dr., marty sorted to -- the circumstances. coast guard officials say the submersible shuttered a catastrophic implosion. you talk about with that actually means? obviously, you know, in the last couple of days, when people thought the running out of oxygen, the idea of what that would mean for those on board. an implosion is very, very quick. >> yeah, that's the one good thing about this horrific tragedy. is that when you get an implosion like that, it happens in a fraction of a millisecond. i mean, it's incredibly quick. it takes more than that, it takes about point 25 more than that for the human brain to even realize it's happening. so, these people would have the entire thing would've collapsed before the individuals inside would even realize that there is a problem. they may have heard a little something ahead of time, they've got a little bit of extra nitrogen in their brain. they probabl

. >> robert mester, i appreciate your expertise. to discuss what may have happened to those on board is florida international university professor and retired navy physician dr. aileen marty. dr. marty, appreciate you being with us. sorry again it's under these circumstances. the coast guard officials say the msubmersible suffered a catastrophic implosion. can you tell us what that actually means? obviously in the last couple days when people thought maybe they were running out of oxygen the idea of what that would mean for those on board. but an implosion is very, very quick. >> yeah. that's the one good thing about this horrific tragedy, is that the -- when you get an implosion like that it happens in a fraction of a millisecond. i mean, it's incredibly quick. and it takes more than that, it takes about .25 more than that for the human brain to even realize it's happening. so these people would have -- the entire thing would have collapsed before the individuals inside would even realize that the -- that there was a problem. they