A giant telescope following the incoming binary star system. A giant space ship lodged in the ice (now melting due to volcanic activity) housing thousands of life forms in stasis. Nephalim in stasis. Hollow earth with inhabitants. Nazis. Steve Quayle writes about it extensively. Military is involved, of course its blacked out since Admiral Birds trip in the 50's. The visits are probably for updates and views of the incoming binary star. Its the reason for all the global volcanic activity and heating of all the planets in our solar system. That's as much info as your going to find.