"Others who consider the Bimini undersea formation to be man-made, as opposed to natural beachrock, are Joseph Manson Valentine, zoologist; Charles Berlitz, linguist; Greg Little, psychologist; R. Cedric Leonard, anthropologist; and Dimitri Rebikoff, French marine engineer.All claim to have investigated the formations in person, and claim to have observed more than one horizontal layer of blocks, at least in places.