i can't stop channelling visions of the Elvish Float...
well are not really elves , are more similar to the Tuatha de Danann are the People of the Reef, the gardeners and shepherds of the Cosmic Reef, not that the Reef needs gardeners and shepherds but is in its nature grow and to attract and filter as a sponge all virtual form of live and host and nurse in Its wombs all that may be symbiotic
But that make the ideal place for gardening and for shepherds , there everything may grow and flourish without anyone caring but the secret for the successful germination and nursing of theirs Floating Domes is accurately kept.
Are no spaceship are closer to that weird seed that falls as helicopters ... only are not moved by our wind but by more subtle cosmic winds
Obviously they all could use the Zarkov Dark Matter Converter , most have even installed , but is kept almost only for the emergencies, for normal travels they prefer be moved by the cosmic streams.
Nowadays the art of germinate , nurse , grow ,inhabit and drive the Floating Domes is lost, except for the People of the Reef