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Well one of my friends worked on a base there for three months as a cook and massage therapist, and she was hanging out with the researchers every day - they are constantly mapping the place.

Has she specifically mentioned the sun circling the horizon and never going down, or was she not there at the right time of year for that (purportedly late October to March)?

No she didn't mention that - I think she was there at that time though.

There are a lot of people down there over summer

Yea..there are so few that talk about the circling sun on-line (or in Youtubes) that I can find. I wonder if they are under orders not to talk about certain things, and just take it to an extreme.