“The Atlanteans had appliances which they would – so to speak – heat with plant seed, and inside of them the life force would turn into technical force.
Thats how their floating vehicles were propelled. These vehicles travelled at a height lower than that of the mountain ranges of the Atlantean period, and they had steering mechanisms by the aid of which they could rise above these mountain ranges.” (Rudolf Steiner)
Source: Rudolf Steiner, “From the Akasha-Chronicles – Our atlantean ancestors”, GA011, page 29