Haisch and Puthoff are desperately trying to find a way of reducing inertia, with the aim perhaps of inventing a reactionless drive;
I wish them luck, but doubt they will be successful.
This pdf
http://www.ufoskeptic.org/JBIS.pdf
suggests that extraterrestrials might already have similar technology, making getting to Earth easier than one might suppose; they then suggest that alien intelligences would fly around the skies of Earth with all their lights on, showing themselves to small groups but hiding from the governments and scientists of the world in order to 'prepare' us mentally for eventual contact?
That seems a pretty unusual strategy if you don't mind me saying so. Dear Mr ET, we need proper contact now, not all this sneaking around.