An investigation has been launched into the disappearance, the Italian news agency Ansa reports.
The images of the Costa Concordia’s bell, taken underwater by divers soon after the vessel sank, became a well-known image associated with the disaster.
At least 30 people are believed to have died when the ship struck rocks near the Tuscan coast in January.
Soon after the Costa Concordia capsized, images taken by divers showed the bell still hanging in position on the wreck, but several metres under water.
The location of the wreck, off the island of Giglio, is considered a crime scene and is continually patrolled by coastguard launches.
This would make it almost impossible for any diver intending to loot the wreck to enter and steal the bell.
It is likely that if the bell’s disappearance is confirmed, suspicion will focus on the search-and-rescue teams, who have constant access to the wreck.
It would have been difficult to get the large, heavy and gleaming bell onto the shore unnoticed – and it is possible that it has simply dislodged itself, he adds.
The Costa Concordia lies half-submerged in a precarious position on an underwater slope, and is considered to be at risk of slipping further into the depths.
Costa Concordia’s captain, Francesco Schettino, denies accusations of manslaughter, causing a shipwreck and abandoning ship before all those aboard were evacuated.
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