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
United States Senate inquiry into the sinking of the RMS Titanic efforts. More than 80 witnesses gave testimony or deposited affidavits. Subjects covered included the ice warnings received, the inadequate number of lifeboats, the handling of the ship and its speed, "Titanic"s distress calls, and the handling of the evacuation of the ship. The subcommittee's report was presented to the United States Senate on May 28, 1912. Its recommendations, along with those of the British inquiry that concluded a few months later, led to changes in safety practices following the disaster. The sinking of , a trans-Atlantic passenger liner owned and operated by the White Star Line, occurred in the early