'Nova: Why Ships Sink'

In this year of the 100th anniversary of the Titanic disaster - as well as much more recent cruise crises - there's been more than the average share of questions about what causes an ocean liner to plunge into the depths.

This episode of PBS' long-running science series poses some of those queries to experts including engineers, with the ever-increasing size of such vessels among the factors considered ... and whether the answers make you feel any safer about taking a voyage is left to you. *** (Not rated)

Buy 'Nova: Why Ships Sink' on DVD.