The Finnish sci-fi comedy 'Iron Sky' centres on real-life SS officer Hans Kammler who was said to have made a significant breakthrough in antigravity experiments towards the end of WW2.
The film relates how, from a secret base built in the Antarctic, the first Nazi spaceships were launched in late 1945 to found the military base Schwarze Sonne – Black Sun – on the dark side of the Moon.
This base was to to be used to build a powerful invasion fleet and return to take over the Earth once the time was right, in this case 2018.