Costa CEO says captain misled company and crew Updated 5:30 p.m. The cruise captain who grounded the Costa Concordia off the Tuscan coast with 4,200 people on board did not relay correct information either to the company or crew after the ship hit rocks, the cruise ship owner's CEO said Friday as the search resumed for 21 missing passengers. CEO Pierluigi Foschi told Italian state TV that the company spoke to the captain at 10:05 p.m. , some 20 minutes after the ship ran aground on Jan. 13, but could not offer proper assistance because the captain's description "did not correspond to the truth," Reuters reported. Capt. Francesco Schettino said only that he had "problems" on board but did not mention hitting rocks. Likewise, Foschi said crew members were not informed of the gravity of the situation. Passenger video shown on Italian TV indicates crew members telling passengers to go to their cabins as late as 10:25 p.m. The abandon ship alarm sounded just before 11 p.m. "That's because they also did not receive correct information on the gravity of the situation," Foschi said. The $450 million Costa Concordia was carrying more than 4,200 passengers and crew when it slammed into well-charted rocks off the island of Giglio a week ago. Eleven people have been confirmed dead. Updated at 2:25 p.m. Rescuers have resumed the search for 21 missing people from the Costa Concordia that ran aground off the Tuscan coast a week ago. Rescue work is taking place at surface level, but not underwater. Coast guard spokesman Cosimo Nicastro said authorities will determine in the morning whether to send divers back to search sections of the partially submerged vessel that are now under water. Sensors installed Thursday show constant vibrations in the ship structure, NBC News has learned. The ship is resting on two points underwater, keeping it from sinking. The remainder of the vessel is hanging and moves. Officials are worried the Concordia will sink further or suffer a sudden drop. The search was suspended earlier in the day after the luxury cruise liner shifted. Updated at 12:55 p.m. Seven days after the ship ran aground and capsized off the Tuscan coast, hopes of finding anyone alive have all but disappeared and the cold waters around the ship have become rougher, with worse weather expected at the weekend. Worries in paradise The fuel is in danger of leaking out and polluting some of the Mediterranean's most unspoiled sea, where dolphins are known to chase playfully after sailboats and fishermen's catches are so prized that wholesalers come from across Italy to scoop up cod, lobsters, scampi, swordfish and other delicacies. Concordia lies dangerously close to a drop-off point on the sea bottom. Should strong waves nudge the vessel from its precarious perch, it could plunge some 20-30 meters (65-90 feet), further complicating the pumping operation and possibly rupturing fuel tanks. Italy's environment minister has warned that if those tanks break, globs of fuel would block sunlight vital for marine life at the seabed. A week after the Concordia struck a reef off the fishing and tourism island of Giglio, flipping on its side, its crippled 114,000-ton hull rests on seabed rich with an underwater prairie of sea grass vital to the ecosystem. The dead weight has likely already damaged a variety of marine life, including endangered sea sponges, and crustaceans and mollusks, even before a drop of any fuel leaks, environmentalists contend. "The longer it stays there, the longer it impedes light from reaching the vegetation," said Francesco Cinelli, an ecology professor at the University of Pisa, in Tuscany. And the sheer weight of the Concordia will also crush sea life, he said. The seabed where the Concordia lies is a flourishing home to Poseidon sea grass native to the Mediterranean, Cinelli told The Associated Press in a telephone interview. "Sea grass ... is to the sea what forests are to terra firma," Cinelli said: They produce oxygen and serve as a refuge for organisms to reproduce or hide from predators. The Tuscan archipelago's seven islands are at the heart of Europe's largest marine park, extending over some 60,000 hectares (150,000 acres) of sea. They include Elba, where Napoleon lived in exile, and the legendary island of Montecristo, a setting for Alexandre Dumas' novel "The Count of Monte Cristo" - where rare Mediterranean monk seals have been spotted near the coast. Montecristo has a two-year waiting list of people hoping to be among the 1,000 people annually escorted ashore by forest rangers to admire the uninhabited island. Navigation, bathing and fishing are strictly prohibited up to 1 kilometer (0.6 miles) from Montecristo's rocky, cove-dotted coast. A monastery, established on Montecristo in the 7th century, was abandoned nine centuries later after repeated pirate raids. Come spring, Porto Ercole's slips will be full, with yachts dropping anchor just outside the port. It lies at the bottom of a steep hill, whose summit gives a panoramic view of a sprawling seaside villa, once a holiday retreat of Dutch royals, and of the crescent-shaped island of Giannutri, with its ancient Roman ruins. Alberto Teodori, 49, who said he has been hired as a skipper for the yachts of Rome's VIPs for 30 years, noted that the area thrives on tourism in the spring and summer and survives on fishing in the offseason. If the Concordia's fuel, "thick as tar," should pollute the sea, "Giglio will be dead for 10, 15 years," Teodori fretted, as workers nearby shellacked the hull of an aging fishing boat. Investigators say Schettino, the captain of the Costa Concordia, steered the ship too close to the Tuscan island of Giglio, where the 114,500 ton vessel ran aground and capsized last week, apparently while performing a maneuver known as a "salute" which took it within 150 metres of the shore.