More notoriously these claims were repeated in Erich von Däniken's Chariots of the Gods (which attributed the knowledge of the coast to extraterrestrials) and Gavin Menzies's 1421: The Year China Discovered America (which attributed it to supposed Chinese voyages), both of which were roundly denounced by both scholars and debunkers of fringe works but which attracted huge popular followings.
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In his book 1421: The Year China Discovered the World, amateur historian Gavin Menzies argues that Zhou Man built a fortess at Bittangabee Bay Australia and that his fleet approached and mapped the Pacific coast of North America and may have been wiped out by a megatsunami resulting from a comet impact creating Mahuika crater.