They spoke also of intermediaries between gods and men – the Urshu, a category of lesser divinities whose title meant 'the Watchers'.3 - Graham Hancock

Shamanism is not confined to specific socio-economic settings or stages of development. It is fundamentally the ability that all of us share, some with and some without the help of hallucinogens, to enter altered states of consciousness and to travel out of body in non-physical realms - there to encounter supernatural entities and gain useful knowledge and healing powers from them.

A dominant individual, with a prestigious position, can delay the progress of knowledge for decades but ultimately cannot stop the buildup of contrary evidence and opinions that will lead to a new paradigm.

The Piri Reis map of 1513 features the western shores of Africa and the eastern shores of North and South America and is also controversially claimed to depict Ice Age Antarctica — as an extension of the southern tip of South America.
The same map depicts a large island lying east of the southeast coast of what is now the United States. Also clearly depicted running along the spine of this island is a 'road' of huge megaliths. In this exact spot during the lowered sea levels of the Ice Age a large island was indeed located until approximately 12,400 years ago. A remnant survives today in the form of the islands of Andros and Bimini. Underwater off Bimini I have scuba-dived on a road of great megaliths exactly like those depicted above water on the Piri Reis map.
Again, the implication, regardless of the separate controversy of whether the so-called Bimini Road is a man-made or natural feature, is that the region must have been explored and mapped before the great floods at the end of the Ice Age caused the sea level to rise and submerged the megaliths.