And I was actually going to say the same thing when I saw your video down below, glad you said it. Yes there is massive underground structures in chile (not to mention vortex), of which the Nazi's of the past had to do now.
Triangular craft can be ET but there are very large ones the "cabal" or secret government has. As early as the late 1980's. They are huge. Still interesting thanks for sharing. Actually upon seeing the video it most likely seems that way, but I do get a tinge of "reptilian" as well.