Several Hwood movies have implied that there are secret underground bases and structures that house advanced alien tech.
Stargate SG-1 had multiple soft disc. implications including
1) Human progenitors - First hominids or in this case probably Martian-Earth hybrids
2) Advanced alien tech - "The Ancients". Oh brother, who came up with this one. Definitely an inside Air Force term someone coined thinking it was awesome sounding.
3) Advanced FTL travel technology.
Of all the fucking places around the world to pick from, ONeil and Carter end up gate transporting to a 2nd abandoned stargate in Antarctica?
You can find remains of giant skeletonized ancient serpents (15-20 miles long) in Antarctica. I had some suspicion that in Antarctica is the location of the Garden of Eden mentioned in the Bible.