Of the bazillion different "Titanic" documentaries, this is not in the upper echelon--but it has good points. There are the usual appearances by family members of passengers, vintage newsreel footage, photos of the ship's interior and so forth.
It would have benefited more if, regarding a couple of its very young commentators, there were some kind of evidence that they have any real-world qualifications regarding Titanic history--one gets the impression that they just looked up "Titanic" info online after school. Others--including the passenger descendants--come across as more credible, with actual experience in documenting Titanic's history.
Still, it's decently written and put together.
The graphics are good, narration is clear and well-written, and there's more than the usual superficial mention of the coal fire that burned for a couple of days below decks. There are a number of interesting background facts regarding some passengers of note that are rarely mentioned in other documentaries. Overall, it's better than many such efforts. Give it a watch.