David M. Jacobs book Revealing the Secret Alien Agenda: The Threat (1998)
briefly summarized is that his hypnosis sessions, constructed to minimize
confabulation, of people who feel they were abducted by aliens, indicate
that aliens, mainly the grays, who themselves are hybrids, and overlorded by
an insectoid being or beings, are kidnapping humans, many repeatedly, to
create successive generations of hybrids of humans and aliens, to the end of
creating a hybrid that is indistinguishable from humans but has alien
characteristics, and that there are now probably millions of such hybrids,
presumably on earth. Some hybrids assist the aliens in their forced
experiences on humans. This is the story.
  However, this is not my point. I seem to recall that some hypnotized
subjects recall aliens referring to coming general disasters upon the earth
and, once or twice, specifically to a  'crack in the world.' There is,
unfortunately, no specific prediction that I shall win the lotto. To the
aliens, good news is no news. But nevertheless, I was recently told that
there is an island in the Azores that is beginning to split in two.
Apparently, it has slipped 30 feet in some direction. Supposedly, if the
whole island is split in two, it will generate a tsunami that will be one
mile high, race across the Atlantic, and destroy all the cities on the
Eastern US coast. The Azores lie almost directly in a line with New York and
Philadelphia, with Washington D.C. close by. Does anyone know anything about
this alleged Azores phenomenon?