Titanic: The Shocking Truth is a 2012 documentary which explores the conspiracy theory that the Titanic never actually sank to the bottom of the Atlantic, but rather that the Titanic was swapped with her already damaged sister ship the Olympic.
The theory suggests that the owner of the Titanic was facing bankruptcy, whilst the owner of the Olympic was facing having to write off their boat after it had collided with a warship. The owners therefore switched boats before the fateful journey, with the owner of the Olympic having a fully functioning vessel and the owner of the Titanic getting an insurance pay out to solve their financial crisis. It would save both parties from financial ruin.
The documentary presents various pieces of evidence which the filmmakers believe proves that the boats were swapped and that it was in fact the Olympic which had sunk on that fateful day.