authorities in Italy have opened a manslaughter investigation into the sinking of a super yacht which killed British Tech Tycoon Mike Lynch and six others off the coast of Sicily earlier this week announcing the probe prosecutor Ambrosio cartosio said investigators found it was not the weather that caused the ship to sink but was a result of the behavior of the crew and the way the boat was handled he said the investigation was not aimed at any individual dot there are many possibilities for culpability it could be just the cap it could be the whole crew it could be the guard we are evaluating all of the factors to see whose Behavior fault can be assigned to cartosio said he added that the prosecutor's office had filed a dossier at present against unknown persons alleging the crime of negligent shipwreck and manslaughter the British flagged vessel with 22 passengers and crew members on board sank on Monday during a violent storm seven bodies have been recovered over the past 4 days with divers working nearly 50 m 160 ft underwater to retrieve them the last believed to be that of Lynch's 18-year-old daughter Hannah was found in the wreck on Friday the other missing people whose bodies were recovered are thought to be those of Morgan Stanley International director Jonathan Bloomer and his wife Judy Bloomer prominent American lawyer Chris morallon and his wife Na morvillo and that of on board Chef recal o Thomas five bodies were found in one cabin and while authorities stressed the the boat needs to be salvaged before they can draw firm conclusions they have speculated the group may have been searching for remaining air pockets as the boat sank the CEO of the firm that owns the boats manufacturer called the super yacht Unsinkable sailing ships it is well known are the safest in the most absolute sense Giovani costantino CEO of the Italian sea group told Sky News in an interview DOT first of all because they have very little surface compared to a yacht facing into the wind second with the structure of the drift Keel they become Unsinkable bodies