Tour-1 : Mysterious Base?
It isn't "secret" though, just not well known. What goes on there is largely uninteresting to most people and is mainly very technical, complicated scientific stuff that is not easy to understand. All of this contributes to numerous conspiracy theories about UFO's, aliens, Nazi bases and other forms of woo-woo. With the advent of the internet and especially of access to satellite images on Google Earth there are plenty of purveyors of snake-oil ready to "interpret" ice-bergs and other ice patterns and structures for the benefit of the gullible, they are never just natural formations, but "clearly" alien or at least secret facilities.