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Titanic director James Cameron says the destroyed Titan submersible should not have been operating. He says many concerns had been raised over the design and material used for the vessel, which is believed to have imploded. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/ Check out our Instagram page: https://www.instagram.com/aljazeeraenglish/ @AljazeeraEnglish #Aljazeeraenglish #News