Found this recently on a conspiracy board and it reminded me of Graham's writing:

What is the Quatria Theory?

central components of what is known as the Quatria Theory.

- Quatria was a global prehistoric seafaring civilization.
- Quatrian civilization existed millions of years ago.
- Quatrians had colonies around the world in far flung locations.
- Their fleet consisted of reed boats capable of withstanding voyages over the high seas.
- Like their boats, all Quatrian cultural artifacts were made of organic materials that have long since deteriorated.
- The Quatrian capital was located in Antarctica, back when the continent was tropical.
- The Piri Reis map and several other very old maps depict Quatria.
- Quatrian civilization was destroyed over the course of hundreds of years by a series of ecological disasters, including volcanic eruptions, massive flooding, and asteroid impacts.
- As coastlines have risen, the remnants of almost all the other ancient Quatrian settlements are now underwater.
- Those that remain will be revealed as the ice in Antarctica melts.
- Evidence of the existence of this civilisation has been systematically destroyed by authorities for millenia, because they view this secret history as a threat to their power.