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Personnel. and one of the big things they can do is target specific individuals using frequencies that are not necessarily discernible to the human ear, but can actually have huge physical effects on the human body. >> so steve, you have to admit it. it sounds like a mystery straight out of the cold war. do we have any idea who did this? >> oh, yeah. this is a bit of a blast from the past but not that far off the beaten path in terms of intelligence collections operations. i think we might be getting a little bit confused in terms of the attack idea. that's a little bit of intelligence jargon....

>> well, wup of the key possibilities here, don, is that it's just like the correspondent in havana mentioned. it could be right out of a spy novel and what we're talking about here is the intelligence services of cuba or russia. and the reason the russians would be involved in this is because they have researched acoustic weapons for many years and they've been looking at how they could possibly use them, not only to gain information but also to conduct attacks on personnel and one of the big things that they can do is target specific individuals using frequencies that are not necessarily dis...

Cell and transform it into other types of cells. >> parts of the heart would then be bio-printed, piece by piece. and soon you would have a new heart. how long would it take to print a heart? >> the printing of the heart, i believe, could be accomplished in essentially a single day. >> dr. williams and his team aren't the only bio-printers on the block. a group at cornell university has bio-printed a human ear. >> cold collagen gel being deposited onto the warm plate. that enables you to get really sharp edges and sharp boundaries. >> it takes dr. larry bernasser and his team just 15 minutes t...

Low frequency vibration. there's a pulse going on, and this pulse, you couldn't hear with the human ear. you would feel it perhaps but you wouldn't be able to hear it with the human ear. they'd sped it up so you can interpret it by the human ear. so that's not really what it sounds like. remember, the lower frequencies in the ocean travel much, much further than higher frequencies. that's what you'll here, that low frequency pulse. it won't give you much characteristics to tell you specifically what it was. >> we showed the map a second ago. the area of interest where the sound came from is a ...

Indicates it's the close e to the pinger, but obviously that wasn't the case. while i'm saddened that the families will have to wait longer i'm anxiously awaiting the results of the next area where they'll search to the north. that's why we had the two-hour length ping receptions so that to me in my mind would be a really good place to look and i think that's going to present some challenges as rob could probably tell us about, but it's a little bit deeper than before. >> what are some of the challenges in your view, rob? >> the challenges are depth, as david says. we're going to a deeper part...