you ignore the civilizations that lived down there for thousands of years and have that kind of technology long before us. they could have build such ships. in fact i do believe the UFO tech is ancient technology. for example the hinuds have something in their legends called "virmana" which essentially is a flying saucer, and at times even a flying castle or city even. now what could that principle be? the tibetians have legends about them lifting heavy rocks with the help of music, singing and sound.
http://www.rense.com/general42/soundlev.htm>The small drum had a very sharp sound, and could be heard even with the other instruments making a terrible din. All the monks were singing and chanting a prayer, slowly increasing the tempo of this unbelievable noise. During the first four minutes nothing happened, then as the speed of the drumming, and the noise, increased, the big stone block started to rock and sway, and suddenly it took off into the air with an increasing speed in the direction of the platform in front of the cave hole 250 metres high.Some accounts tell that the pyramids were build in a similar fashion. Now i agree this sounds pretty ridiculous, but then there is this stuff
https://www.youtube.com/watch?v=ZqRA7m1KEGQ https://www.youtube.com/watch?v=0K8zs-KSitc indeed it sounds like it underlies another principle than the story of the tibetians, but there were stories about levitating stuff with sound, and now we can actually do that. so maybe there is more to the legends than we care to believe. and there are quite a few legends that turned out to be real or at least have
Interestingly this plan of the Vril Saucer has under number 1 mentioned "glocke" which translates to "bell". is this what makes the Saucer fly?
They fly either through this, or manipulating the magnetic field i believe.
in general i believe a lot of that (ancient) alien stuff comes only from thinking we are able to accomplish much less than we are actually capable of
