30 years after one of Europe's worst maritime disasters, alternative theories persist

The 1994 sinking of the ferry Estonia is up there with the Titanic as one of the worst maritime disasters in history. This week, a Swedish-Estonian-Finnish investigative team said the shipwreck, which led to the deaths of more than 800 people, was caused by a structural failure. Their report is a bid to put to rest 30 years of controversy surrounding the cause of the sinking, as Kristjan Tabri tells Host Marco Werman. He's a professor of marine technology at the Tallinn University of Technology.