Insights into the Titanic submersible's history and downfall.

A college student from Agawam, Massachusetts, had the opportunity to tour the Titan submersible two years before it imploded underwater, killing five people. Evan Lyne, now 21, said he felt claustrophobic during the tour, which lasted only a few minutes. The expedition was not presented as a tourism opportunity to the students, but rather as a research opportunity. The U.S. Coast Guard is continuing its remote search for the submersible, which is believed to have imploded.