This is the theory proposed by Elaine Morgan in her popular book The Scars of Evolution. Traditional evolutionary theory posits that humans separated from monkeys when our ancestors dropped from trees to hunt animals on the dry African plains. One would think, if man has been in the process of evolving on land for a million years, and with so many paleoanthropologists searching for these remains, there would now be an abundance of such remains available everywhere to document our human evolution. The remarkable fact is that all the physical evidence we have for human evolution can still be placed, with room to spare, inside a single coffin. . . . This extreme scarcity of authentic hominid fossils is probably why paleoanthropologists feud so vigorously among themselves as to whose fossils are the best and oldest.
Some evolutionists think the time is ripe for promoting aquatic apes as the real key.
While largely ignored by many mainstream anthropologists, the aquatic ape theory has been attracting increasing scientific interest. When earlier published in England, The Scars of Evolution was positively reviewed in scientific journals. However, the aquatic-ape theorists are probably right about this particular aspect. The reason why anthropologists can find so few fossils of primitive people is that they were all drowned and their remains, if they survived scavengers and decay processes after drowning, are now buried in the sediments at the bottom of the sea. The Flood waters now comprise the world's oceans, which cover two-thirds of the earth's surface, reaching deeper depths than the highest mountains.