“We have opened an investigation against unknown persons on charges of manslaughter and culpable homicide,” prosecutor Ambrogio Cartosio told a news conference in the Sicilian town of Termini Imerese on Saturday morning. The previous Monday the Bayesian superyacht sank off the coast of Porticello, a small town on the coast near Sicily’s capital Palermo. Seven of the 22 people on board lost their lives in the shipwreck, among them British technology magnate Mike Lynch and his daughter Hannah. Cartosio confirmed the start of the investigation, but said no suspects had been identified at the mome…