Rocket and Submarine Inventor Under Scrutiny in Disappearance of Swedish Journalistbr Mr. Madsen began launching submarines in 2002, and had taken visitors onto his third and latest submarine, the UC3 Nautilus, in the past; Ms. Wall had told her familybr that she was going to Denmark to interview Mr. Madsen.br After initially telling investigators that he had dropped off Ms. Wall at a remote section of the port of Copenhagen, Mr. Madsen — who has been charged with involuntary manslaughter — changed his story to saybr that Ms. Wall died while on board his ship and that he buried her body at sea.br "I loved the idea that a fully armed rocket stood behind the school," Mr. Madsen told his biographer.br Mr.