The youngest person to visit the Titanic wreckage claims he 'fell unconscious' during the mission.
Sebastian Harris, 13, said a lack of oxygen in the Mir II submersible caused him to fall asleep suddenly.
He added: "While we got down to [the] depth where it flowed over the bow, I spent some time placing a plaque. And then shortly after that, you know, as far as I knew, I fell asleep essentially.
