Before turning to Archangel Raphael on healing and octagons, David Wilcock posted a video February 2019 (that is not available now) called New Revelations, (1) in which he talked about an emerald octagon structure found under the ice in Antarctica
David mentioned that due to planetary pole shifts the lost civilization of Atlantis may be found in Antarctica.
In March of 2012, Archangel Raphael through Linda Dillon, channel for the Council of Love, spoke to us of his Emerald Octagon healing chamber at the base of the golden spiral.
Archangel Raphael explains the octagon shape and the number 8:
“Come with me to the foot of the golden spiral because there I have placed my Emerald Octagon, the healing chamber that I have created for you, for each one of you.
“It is an octagon because 8 is the number of creation.
“It is the dimension of creation, and I also want you to come to understand, to fully comprehend, that there is no difference between healing and creation.”
“You have need to know that the healing chambers aboard the ships of your star brothers and sisters have been modelled on this chamber.
“It is ancient wisdom and it is used throughout the multiverse.” (2)