One that has always been praised is Titanic: Death of a dream. It's split into to parts and lasts 3 hours in total. Part one tells us about the events leading up to the sinking. Part two tells us about the sinking and its effects and aftermath. The documentary has interviews with some of the last survivors as well as historical consultants (such as Don Lynch, Ken Marschall, Walter Lord) as well as other people such as Stanley Lord (son of Captain Stanley Lord of the Calafornian). The documentary is narrated by David McCallum who also played Harold Bride (the wireless operator) in A Night to Remember.