Hi there. I find no credibility in the Nazi/Blonde alien link which I've read connected with Hollow earth stuff too from that Byrd diary.
For those interested in Vril here is a link to the book by Edward Bulmer Lytton - Vril The Power Of The Coming Race. It's one of many books on Earth Mysteries on the site.
http://www.sacred-texts.com/atl/vril/index.htm
There is also a book 'The Comte de Gabalis' which although a cabalistic allegory relates that the world is full of different elemental beings existing at dirrerent frequencies or elements. It can be taken many ways but the descriptions of these beings mirror current archetypes - Nordic, Reptilian etc. Check Discourse 2 for this. Discourse 5 tells of an event where the Sylphs appeared in aerial ships over France and even abducted men to show them their home before returning them. The book is from 1670.
None of it should be taken at face value but it's an interesting book and the notes are full of little nuggets too.
http://www.sacred-texts.com/eso/cdg/index.htm