From the Movie Snob:

Ghosts of the Abyss. (B) This is a 3D IMAX movie by James Cameron about his 2001 expedition to explore the remains of the Titanic. Actor Bill Paxton is along for the ride. On the downside, there's way too much oohing and ahhing from Paxton, Cameron, and the rest of the crew, and the 3D effects are not generally all that impressive. But on the plus side, the film does afford some incredible visuals of the Titanic, slowly crumbling into its constituent elements at the bottom of the Atlantic, 2 1/2 miles down. And you get to hear some interesting factoids about what happened aboard the ship the night she sank. I thought I got my money's worth.