Wreck of the RMS Titanic research. The stern section, which had previously received relatively little attention from explorers, was specifically targeted for analysis. The microbial colonies aboard "Titanic" were also a key focus of investigation. The second expedition, from 27 May – 12 June 2004, saw the return of Robert Ballard to "Titanic" nearly 20 years after he discovered it. The expedition spent 11 days on the wreck, carrying out high-resolution mapping using video and stereoscopic still images. 2005 saw two expeditions to the "Titanic". James Cameron returned for the third and last time to film "Last Mysteries of the Titanic". Another expedition searched for
Heart of the Ocean Stuart. It is believed that both Rose and the necklace went down with the sinking of the ship, leading some treasure salvagers to believe the necklace lies somewhere within the wreck of the "Titanic". The story of the Hope Diamond bears many similarities to the story of the Heart of the Ocean with the obvious exception of the Hope Diamond not actually having been on board the Titanic. In the 1953 film "Titanic", a blue diamond plays an important role in a love affair as well. A primary plot point in this earlier film is the theft of the diamond,