Nova: "Why Ships SInk"
PBS, 9:00 p.m. ET
(Check Local Listings) There are two recent news hooks to this hour – the 100th anniversary of the sinking of the Titanic, and last year’s maritime accident with Italy’s Costa Concordia, which hit a reef and ran aground off the Tuscany coast. But rather than limit itself merely to those two high-profile events, this edition of Nova has a lot more ground to cover. Well, a lot more water.