Its key aims were to assess the current condition of the wreck site and carry out scientific observations to support ongoing 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.[67] The second expedition, from 27 May – 12 June 2004, saw the return of Robert Ballard to Titanic nearly 20 years after he discovered it.