Cruise disaster: ship shifting off rock into the sea "The company will be close to the captain and will provide him with all the necessary assistance, but we need to acknowledge the facts and we cannot deny human error," Pier Luigi Foschi told reporters at a press conference in Genoa. Costa Crociere had earlier said "preliminary indications" suggested Captain Francesco Schettino may have been guilty of "significant human error" which resulted in the Costa Concordia running aground, sparking a frantic evacuation operation. The ship's Italian owner, a subsidiary of Carnival Cruise lines, said: "We are working with investigators to find out precisely what went wrong aboard the Costa Concordia. Italian prosecutors claim Captain Francesco Schettino, 52, had approached the island's coastline in a "carelessly clumsy manner" in the moments before a catastrophic collision with an underwater rock formation that caused the ship to list violently and eventually capsize. With the weather deteriorating and the sea becoming choppier, the 1,000 ft long vessel is beginning to shift its position, raising fears that it could slide deeper into the sea and rupture its fuel tanks. The ship came to rest on its side in about 15m/45ft of water just outside Giglio's tiny harbour after smashing into a rocky shoal on Friday night and tearing a huge gash in its hull. "It is definitely moving," an international salvage expert, who asked not to be named, told The Daily Telegraph. We think the hull has been pierced by a couple of pinnacles of rock but if it starts moving around a lot, it could break free, and that would be a big problem. The Italian fire service, which is spearheading search and rescue operations, also confirmed that the ship is shifting as a result of the worsening weather off the coast of Tuscany. The death toll from Friday night's disaster, one of the worst in the cruise industry's recent history, rose to six today after rescuers discovered three more victims, including the bodies of two elderly men wearing life vests inside the vessel. A further 15 people remained missing. The ship approached the port from the south but sailed too close to the coastline and struck a rocky reef, known to locals as "Le Scole," a few hundred yards out. Pier Luigi Foschi, chairman and chief executive of Costa Crociere, will today face the media for the first time at two press conferences in Genoa, as Italian prosecutors continue to question Capt Schettino in custody. He is reportedly being held on suspicion of multiple manslaughter and abandoning ship.