It is a mystery
Tory Lanez Stan
I thought it was water only because every video I've seen of this type of technology was always over waterI don't understand the physics that would make it required to work only on a water surface and not land. The ones in the past used water for propulsion so you needed water as the surface, this sounds turbine powered with basic atmosphere. It should work on land as far as I can tell. They used water for safety in case of failure.