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That type of pressure bottle. but for something that's seeing external pressure all of the advantages of composite materials go away and all the disadvantages come into play. so if you're using a uniform material like steel or titanium or ceramic or acrylic, you can do computer modeling with a high degree of accuracy and confidence. the second you start doing carbon composite or any kind of composite materials you're introducing two materials that are in contact with each other. the filament itself and then the epoxy matrix that it sits within. and at that point you have degradation failure. s...

Start doing carbon composite, or any kind of composite material. they're introducing to materials that are in contact with each other. the filament itself, and then the approximate tricks that it sits within. at that point, you have degradation failure. so, we always understood that this was the wrong material for submersibles. because with each pressure cycle, you can have progressive damage. so, it's quite insidious. you may have a number of successful dives, which is what happened here, and then have it fail later. if i were diving in a sub that was fully certified, i wouldn't think about i...

Undersea adventurer himself whose been to the scene of the titanic. >> we always understood this was the wrong material for submersible hulls because with each pressure cycle you can have damage. it's quite insidious. that lulled them into a sense of confidence and led to this tragedy. >> reporter: he was very critical of the mission and has been very outspoken about this. it's unclear at this point how much of this was communicated to oceangate before this mission. this is the third time they went down to see the titanic. there were two successful missions last year and the year before. the c...

Not that deep when it imploded. they say construction involved the innovative use of modern materials. >> this is another three and a quarter inch tie and the yum dome bolted to another piece. >>reporter: that connection the glue and those modern materials will be a focus for investigators. >> it's completely inappropriate for a vessel that sees external pressure. >>reporter: james cameron directed titanic and drived down to the wreckage himself 33 times. >> we always understood that this was the wrong material for submersible hills because with each pressure cycle, you can have progressive da...

Time it flies. think of the plane's fuselage as a balloon. every time it goes up, the outside of the plane or the skin expands. that's from the cabin being pressurized so people can breathe at high altitudes where the air is thin. when the plane comes down, the skin contracts. every takeoff and landing, no matter how long or short the trip, is considered one cycle. and each cycle puts stress on an airplane, potentially causing microscopic cracks. >> so you have this constant pressure cycle where it expands, contracts, expands and contracts. over a period of time, the metal will eventually star...