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
Wreck of the RMS Titanic day of the expedition, an object that looked like a propeller was found. Grimm announced on his return to Boston that "Titanic" had been found, but the scientists declined to endorse his identification. In July 1983, Grimm went back a third time with Ryan aboard the research vessel "Robert D. Conrad" to have another look at the "propeller". This time nothing was found and very bad weather brought an early end to the expedition. It later turned out that Sea MARC had actually passed over "Titanic" but had failed to detect it, while Deep Tow passed within of the wreck.