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 organisms that they found in and around "Titanic". A total of 28 species were observed, including sea anemones, crabs, shrimp, starfish, and rattail fish up to a yard (1 m) long. Much larger creatures have been glimpsed by explorers. Some of "Titanic"s fauna has never been seen anywhere else; James Cameron's 2001 expedition discovered a previously unknown type of sea cucumber, lavender with a glowing row of phosphorescent "portholes" along its side. A newly discovered species of rust-eating bacterium found on the ship has been named "Halomonas titanicae", which has been found to cause rapid decay of the wreck. Henrietta