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Dr Harry Bennett, an expert in maritime history, said the dive team had found "the underwater archaeological equivalent of a needle in a haystack".

Prof Herrero also said it is the first time scientists have discovered a stone in an archaeological context with a red ochre dot, meaning Neanderthals brought it to the shelter.

"We disapprove of any commercial pursuit that distorts the value of archaeological sites, which are a legacy of our indigenous cultures and the pride of our nation," she said.

An archaeological dig began at the site last month, which uncovered an unopened Victorian soft drink.

There are decorative patterns at the archway entrance of the library that were modeled after Labna, a Mesoamerican archaeological site that’s known as a portal.