In 1995, controversial book 'Fingerprints of the Gods' made waves by claiming a highly advanced civilisation was wiped out by a comet strike in Antarctica 13,000 years ago.
The book was widely panned by academics despite selling three million copies. Now Graham Hancock claims to have found clear evidence to support his theory.
In an upcoming sequel, Hancock says he has outlined the "smoking gun" he lacked 20 years ago.
"In 1995, I wrote a book about all the clues - the fingerprints - that pointed to the existence of this lost civilisation," Hancock told The Sunday Times.
"But what I lacked was a smoking gun. Now we have it.
"A series of papers in geophysics and geological journals have been bringing forward evidence that the Earth was indeed hit by a comet 12,800 years ago, which is exactly what I proposed in my book."
The new 500 page book, titled 'Magicians of the Gods', will be published in September, and will contain geological proof of a comet strike in Antarctica 12,800 years ago, Hancock says.