Before this special, there was "Titanic 20 Years Later with James Cameron" That special showed how the Titanic wreckage was found back in the 1980s, talked to some of the survivors' offsprings, how the Titanic most likely sank vs what the movie showed, and other interesting theories/facts. Mostly showing you what the movie got right and what it got wrong. It's a great TV special or mini documentary, going in-depth with how the Titanic may have sank and if having the right amount of lifeboats would've made any difference.

With that said, the "Titanic 25 Years Later with James Cameron" shows most of that in the first half of this TV special or mini documentary, sans the survivors' offsprings. The new content is at the last half of the special. It's James Cameron with a team of experts trying to myth bust the "Jack & Rose on the same debris" theory. It's well done, going in-depth and covering a lot of things such as hypothermia, reenacting events that took place in the movie, and how both of them could've survived.

Personally, it's better to watch the entire "Titanic 20 Years Later with James Cameron" special and then watch the last half of "Titanic 25 Years Later with James Cameron" to get the best of both worlds.

One side of me wished they created a whole new special (which may have turned out to be a 18 minute one) and the other side appreciates them adding the bits from the last special onto this for those who may have missed it.