“The Atlanteans had devices which they heated with plant seeds, and in it life force was transformed into technically utilizable power.
In this way the vehicles of the Atlanteans were moved, hovering at low altitude above the ground.
These vehicles drove at a level that was lower than the height of the mountains of the Atlantean period, and they had control devices, through which they were able to rise above these mountains.“ (Rudolf Steiner)
Source: Rudolf Steiner – ”From the Akasha Chronicles – Our Atlantean ancestors“, complete works volume 11, (GA011, page 29)