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hull and how safe it really was. one them in a counter lawsuit claimed that oceangate really hadn't gone through enough testing and another former employee told cnn on the condition of anonymity that they were concerned when the hull arrived and was only five inches thick rather than seven inches thick as they say they been assured by the company. >> we always understood that this was the wrong material for submersible hulls. with each pressure cycle you can have progressive damage. >> expert diver and "titanic" film director james cameron slammed oceangate for not certifying the vessel. >> even in my own sub, which a steel hull, i knew that if i dove several two, three times, it was good to go because you could cycle steel hundreds of times if not thousands of times. but that's not the case with composites. it's insidious and i think that lulled them into a sense of
this technology is what we need to explore the ocean depth. >> we learned about two former oceangate employees who had raised concerns about "titan's" hull and how safe it really was. one them in a counter lawsuit claimed that oceangate really hadn't gone through enough testing and another former employee told cnn on the condition of anonymity that they were concerned when the hull arrived and was only five inches thick rather than seven inches thick as they say they been assured by the company. >> we always understood that this was the wrong material for submersible hulls. with each pressure cycle you can have progressive damage. >> expert diver and "titanic" film director james cameron slammed oceangate for not certifying the vessel. >> even in my own sub, which a steel hull, i knew that if i dove several two, three times, it was good to go because you could cycle steel hundreds of
not engineers separately raised concerns about the safety of the hull of the "titan" sub made of composite materials. james cameron who has made over 30 dives to the titanic says that it is known to the engineering community. >> we have always understood that it is the wrong material for the submersible hulls, because with each pressure cycle, you can have pressure damage. it is insidious, and this is what led to the overconfidence and led to the tragedy. >> reporter: i interviewed is stockton rush as a reporter in seattle, and i pressed him about the safety of the vessels, and he told me that he viewed submersibles as armored vehicles, kate. before another expedition he said to me, quote, everyone is getting back safe, and we can take risks with equipment buck not people, and many in the
you are answering those questions in real time. >> reporter: will coning who chairs the marine technology society says he wrote to rush, concern oceangate was not following the same safety standards as other vessels. in this 2018 letter he warned about what he called the company's experimental approach that could have serious consequences. cnn has previously reported two former employees who are not engineers separately raised safety concerns years ago about the hull of the saw. it was made of carbon fiber composite, the type of materials used in spacecraft. till maker james cameron who has made more than 30 dyes to the wreckage himself says the danger of using carver harbor composite is known within the engineering community. >> we always understood this was the wrong material for submersible hulls. with each cycle you can have
you can tell us more of what that mean, because it is the stuff that is used in spacecraft, but is it designed for the deep underwater pressure, and what is the danger of that material in this environment? >> it is completely inappropriate for a vessel that sees external pressure. you know, carbon fiber composites are used very successfully for internal vessel pressures for say a scuba tank, and you can get two the three times multiple what you can get out of steel or aluminum for that type of the pressure bottle, but for something that is seeing the external pressure, all of the benefits go away, and all of the disadvantages come into play. we have always understood that this is the wrong material for the submersible hulls, because with each cycle, you can have progressive damage. so it is insidious, because you could have successful dives and