Ghosts of the Abyss (2003)

James Cameron goes back to the real Titanic wreck with actor Bill Paxton, and the cameras explore the ship inside as well as out. Kids who know the story from the 1997 movie get to see the actual rooms where it happened. Shot in 3D for IMAX, the theatrical version runs about an hour (a longer 90-minute cut came out on home video). It is rated G in the US and PG in the UK, so it suits the younger end of the range. The quiet, drifting views of a ship where nearly 1,500 people died carry the weight of the story without anything frightening on screen, and tend to bring the questions on their own.