The Nazi Party actually began as an occult fraternity, before it morphed into a political party.
One engineering school is even promoting a fascinating course on the relationship between the occult and technology.
“occult” literally means “hidden from view,” which is why we use it both in astronomy and to refer to secret knowledge.
1530s, "secret, not divulged," from Middle French occulte and directly from Latin occultus "hidden, concealed, secret," past participle of occulere "cover over, conceal," from ob "over" (see ob-) + a verb related to celare "to hide," from PIE root *kel- "to hide" (see cell). Meaning "not apprehended by the mind, beyond the range of understanding" is from 1540s. The association with the supernatural sciences (magic, alchemy, astrology, etc.) dates from 1630s.
occult oc·cult (ə-kŭlt', ŏk'ŭlt')
Detectable only by microscopic examination or chemical analysis.
Not accompanied by readily detectable signs or symptoms.