Sheehan - the ufo phenomena appears to be extradimensional which I think to be a function of how they travel and move and it and it gives the appearance of being extradimensional by being able to appear and disappear (hivelink)
Spatial size control ala antman technology could be what Sheehan is talking about. The ability to shrink the physical size to minute to appear to disappear and then move seemingly cloaked from view.
(hivelink)no youtube