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develop. >> reporter: david marquette. the coast guard says the 22-foot titan broke into fields of debris including its nose cone and both of the pressure hole made of carbon fiber and titanium. the hull likely imploded due to water pressure. did carbon fiber present a risk? >> what happens when it gets frozen and compressed? and warmed and relax? >> reporter: titanic director james cameron is an expert on deepwater exploration. he felt the use of carbon fiber posed a risk. >> i was very suspect of the technology they were using. i wouldn't have gotten that sub. >> reporter: growing questions to mike that safety concerns were ignored by oceangate ceo stockton rush, who was titling g