Call for Costa Concordia to be chained down Divers searching for missing passengers will be allowed back on the Costa Concordia on Saturday after being evacuated due to movement of the ship. Photograph: Vincenzo Pinto/AFP/Getty Images An Italian government minister has called for the marooned cruise ship Costa Concordia to be chained to the sea bed to stop it slipping into deep water as a British passenger said she would sue the owners after she lost her husband's ashes while abandoning ship. Experts using sensors to monitor the movement of the vessel, which is lying on its side in 37 metres of water off the Tuscan island of Giglio, said it was shifting at a rate of about 7mm an hour. Divers searching for missing passengers were due to be allowed back on board the ship on Saturday after being evacuated for the third time on Friday when sensors picked up movement from the vessel. If the wreck moves 30 metres offshore it will fall into depths of 70 metres. Eleven passengers are known to have died after the captain, Francesco Schettino, steered the 114,000-tonne vessel carrying more than 4,200 passengers and crew into a rocky outcrop on 13 January while attempting to "salute" a Giglio resident. Schettino, who then grounded the ship and went ashore while 300 passengers were still on board, is currently under house arrest, accused of manslaughter, causing a shipwreck and abandoning ship. Eleven people are known to have died. A miniature robot submarine was in action on Friday under the ship's hull, checking the stability of the ship, which is lodged on three granite outcrops. They are searching for places the ship could be anchored after Italy's environment minister, Corrado Clini, asked the liner's owner, Costa Crociere, to draw up a plan for tying the ship down to prevent it slipping into the deeper water. Luca Cari, a spokesman for divers from Italy's fire service, said the robot had used its pincer arms to pick up two suitcases found on the sea bed. Clini has warned that approaching bad weather may shunt the ship out to sea, where its fuel tanks could rupture, creating an oil slick. Divers have said they will continue their search effort until they find all 21 passengers still unaccounted for, although Dutch salvage workers are gathering in the port of Giglio to start drilling into the ship's fuel tanks to extract 2,400 tonnes of fuel. The shipwreck could yet see the largest insurance payout of any maritime disaster, said Antonio Coviello, an insurance expert at the University of Naples. As passengers who escaped from the listing vessel prepared legal action against Costa Crociere, one British passenger said she was suing after losing the ashes of her late husband during the evacuation. Sandra Rodgers, 62, said she had been planning to scatter the ashes of her husband, Barry, when the cruise reached Monaco because he had dreamed of seeing the Monaco Grand Prix. "It's dreadful but his ashes were lost on board the Concordia as well as other family heirlooms from my late mother and father," she said. Rodgers said the evacuation was completely chaotic: "There was certainly no 'women and children first' policy. We were also told by crew that we should go back to our cabin. Thank God we didn't do as they had told us as we may not have made it off the ship alive. Newly released video footage taken on board after the ship collided with rocks shows a female member of the crew telling passengers wearing lifejackets: "On behalf of the captain, kindly go back to your cabins." She adds: "We have solved the problem, which was an electrical problem ... All is under control. Schettino's lawyer said on Friday the captain was "ready to take responsibility" for his actions and denied allegations he had freely drunk red wine shortly before taking the helm on the night of the collision. Schettino said he had kept officials at Costa Crociere informed of the ship's plight, a claim rejected on Friday by the chief executive, Pier Luigi Foschi, who said lives would have been saved if the ship had been abandoned faster. Foschi denied the firm encouraged Schettino to delay abandoning ship for about an hour after the collision for fear that payouts to passengers would be triggered. "I can assure you absolutely that no one was thinking in financial terms, which would have been in contravention of our code of ethics," he told Corriere della Sera. Foschi said the firm has suspended Schettino and would not pay his legal fees. He may have the odd little character problem, although nothing has ever been reported formally. He was seen as being a little hard on his colleagues. He liked to be in the limelight. On the quayside at Giglio on Friday, police formed human chains to keep camera crews away from relatives of some of the 21 missing passengers as they climbed on board a coastguard launch to throw flowers into the sea beside the Costa Concordia.