Reading Graham Hancock's "Underworld. Flooded Kingdoms of the Ice Age" (Hancock 2) I find a few more pieces to our puzzle.

The first of these pieces, which I would like to present, is a myth about the fisherman Urashima and his meeting with a sea spirit (Kami). What strikes me most in this story is that here a turtle is transformed into a human being, a beautiful woman.

The parallel with the turtle found when Hotua Matu'a arrived to Easter Island is obvious:

"On the sand at Turtle Bay they saw a turtle sleeping. Those six young men came on, they arrived at the turtle, they seized it. The turtle struck with its flipper, one was wounded. They carried; the turtle escaped. They carried a man instead of the turtle!"

Moreover the turtle which Urashima caught had five colours. This - I think - confirms that we are on the right track. Because five here means the five cardinal points of the earth turtle, Pawahtun:

"The iconography of the West Building, with 7 exterior doorways (7 is the mystic number of the earth's surface), and figures of Pawahtun - the earth god as a turtle - indicate this to be the Middleworld, the place of the sun's descent into the Underworld."

The 5th cardinal point is located at the top of the mountan (pyramid), and projected onto a two-dimensional map it is located in the middle. Each cardinal point has a colour of its own. The Mayan cardinal points have blue-green in the middle, quite in agreement with "something in the form of a blue-orchid soared up to the blue sky with the wind and clouds".