Make this less roundabout:
Walsh joined the team that oversaw the dive of the " Deepsea Challenger " mission where James Cameron dove solo to the bottom of the Mariana Trench on March 26, 2012.
They were the only two people to do this until March 26, 2012, when James Cameron reached the bottom. <SEP> It has been reported that Don Walsh was on the team that oversaw James ' journey.