Santilli claims to have detected "at least twotypes" of "Invisible Terrestrial Entities" (ITEs): dark,which leave a dark image on a bright background of adigital camera attached to the telescope, and brightITEs that do the opposite.
Santilli's unusual claims on detecting invisible alien entities and covert surveillance is highly speculative. His works are consider pseudoscience in many cases and he believes there is a Jewish scientific cabal of corruption suppressing his work.