It was the second deadliest peacetime sinking of a European ship since Titanic Treaty declared site a marine grave and prohibited any exploration of the wreck Swedish filmmaker Henrik Evertsson, 33, says he used drone to film wreckage of the MS Estonia when his crew discovered a gaping hole in the hull of the ferry Film reveals official Swedish report admitted ferry was used by Swedish forces to smuggle Russian military technology out of Tallinn weeks before it sank The MS Estonia was some five hours into its overnight voyage from Tallinn, the capital of Estonia, to Stockholm in Sweden when its captain, Arvo Andresson, noticed the first indications of trouble.