First link to original video https://www.youtube.com/watch?v=DncHASo83FE&t=2s
Link to Sky Free Channel https://www.youtube.com/channel/UCuBgjkbhNUaUiulVMoSJasw
This is a video comparison from a scaled down version of a boat observation to a real observation of boat within the mirror zone.
Any objects that go into this zone will vanish bottom up not due to curvature but due to the optical effcts of the weather conditions.
the tests that Sky Free are doing can be done by just about anyone so please feel free to conduct your own tests if you question the FE narrative.