Other experts were more upbeat about the chances that some sort of salvage operation might work.
He added that the gutta percha, which would have been stored as cargo, could have been released during a salvage operation.
The salvage operation at the disaster site wound down on Monday, the first day in which workers didn't find a corpse.
Rescuers fear the toll could still rise as the salvage operation shifts from search and rescue to recovering corpses buried in the wreckage.
The four people on board were rescued by the lifeboat on Sunday and a salvage operation on the vessel was underway on Monday.
People just do not want to spend their holiday in a place that is the scene of a colossal salvage operation, our correspondent adds.
Duminy mounted an impressive salvage operation after the tourists' poor start.
"As the hull has been removed, the team is now shifting their effort to collecting minor debris that remains on the reef, " the head of the salvage operation, Navy Capt.
Hasan Suhrawardy, who is leading the army's salvage operation, said the pace would now slow again, since Ms. Begum's survival had raised hopes, however slight, that other survivors could be in the wreckage.
Sarwat Okasha was one of the main architects of the operation to salvage the Nubian temples.
As residents try to rebuild their lives, a non-for-profit charity called "Operation Photo Rescue" has been helping them to salvage treasured memories by restoring photographs damaged in the natural disaster.
BBC: Salvaging photographs - and memories - damaged by Sandy
The operation to right the Concordia is the biggest maritime salvage exercise ever undertaken with 111 divers working in shifts 24 hours a day from a floating accommodation support vessel tethered next to the wreck.
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