James Cameron, the director of the multiple Oscar-winning film 'Titanic', has reacted to the deaths of the five passengers on board the Titan, the tourist submersible that went missing. The director said that the diving community was "deeply concerned" about the submersible's safety even before Sunday's expedition.

Cameron told ABC News, "A number of the top players in the deep submergence engineering community even wrote letters to the company, saying that what they were doing was too experimental to carry passengers and that it needed to be certified."