Titanic: 20 Years Later with James Cameron

James Cameron released Titanic 20 years ago promising a "living history," saying he owed the truth to those souls lost in 1912. Now, in this 1-hour special, Cameron gathers experts to re-open the case file, asking: "Did we get it right?" Drawing from 33 dives to the wreck and years of forensic analysis, he explores the myths and mysteries of Titanic, mounting tests on the disaster, hoping to answer questions that have troubled him for decades. (National Geographic)