The "Surgeon's Photograph," which was the most widely circulated image of the Loch Ness Monster, was a hoax. The blurry black-and-white photo that supposedly showed the neck and head of Nessie was actually a photo of a toy submarine with a sculpted head and neck attached.
The hoax was intended to get revenge on the Daily Mail tabloid for having mocked its employee Marmaduke Wetherell in its publication. Wetherell enlisted the help of his son-in-law, Christian Spurling, and his son, Ian, to build the fake "beast;" and the photos were then given to surgeon Robert Kenneth Wilson to turn in to the Daily Mail.
The photo first appeared in the tabloid on April 21, 1934, and the hoax was brought to light via The Sunday Telegraph on December 7, 1975.