I have never seen this DVD so I won't comment on its content but what I will do is offer my opinion about what has been done to the remains of this great ship and direct you to a pretty darn good forensic documentary about Titanic's final minutes on the surface.
I gave this four stars out of respect for the man who discovered The Titanic and the ship itself but I think it is disgraceful what past expeditions have done to the graveyard of this ship, granted, going to the artifacts shows has been an emotional roller coaster ride, seeing clothes and belongings that used to belong to people that are no longer living because they died onboard was just very difficult sometimes.
Personally, I would have rather have seen these articles left where they were as a monument to the thousands who died there, the ship itself is dissolving and will one day be an orange stain at the bottom of the ocean with nothing left of it but propellers and possibly the three story tall engines.
As for the documentary on some excellent forensic work on her striking the berg and subsequent sinking, you have to seek out the latest release of James Cameron's "Titanic" and in the special features, look for "Titanic: The Final Word", its very informative and it really gets to the root of what happened that night.
Cameron seems very determined, along with six other notably fine Titanic experts, go at it for close to two hours to piece together aspects of the collision, the flooding, the sinking and the fall to the ocean floor.
They also discuss how the boilers and other items from inside the ship, their location on the sea floor, determined where the Titanic broke up on the surface.
All in all, this documentary itself is worth a look at.."Titanic: The Final Word"...Check it out.