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On June 10, I made the third dive down to the Titanic. After a routine pre-dive and launch, by 7:30 a.m. my two observers, Bob Ballard and Martin Bowen, and I were on our way to the bottom. Heading to the bottom in Alvin is actually pretty relaxing. Well, as relaxing as you can get in a 6-foot sphere. It is still warm inside, not yet cooled off by the cold temperatures of the deep ocean. Once you flood the ballast tanks and sink, you leave behind the motion of the waves and begin the two-and-one-half-hour free fall to the bottom. The Titanic lies at a depth of 3,996 meters, about 2.5 miles down.
See link below for more:
http://www.whoi.edu/oceanus/viewArticle.do?id=80686§ionid=1000
