In the early 1970s, a group of people led by Robert Rines obtained some underwater photographs. One was a vague image, perhaps of a rhomboid flipper (though others have dismissed the image as air bubbles or a fish fin).
On the basis of this photograph, British naturalist Peter Scott announced in 1975 that the scientific name of the monster would henceforth be Nessiteras rhombopteryx (Greek for "The Ness monster with diamond-shaped fin"). This would enable Nessie to be added to a British register of officially protected wildlife (but compare ). Scottish politician Nicholas Fairbairn soon revealed that the name was an anagram for "Monster hoax by Sir Peter S".
The underwater photos were reportedly obtained by painstakingly sonaring the loch depths for unusual underwater activity. A submersible camera with an affixed, high-powered light (necessary for penetrating Loch Ness' notorious murk) was deployed to record images below the surface. Several of the photographs, despite their obviously murky quality, did indeed seem to show an animal resembling a plesiosaur in various positions and lightings.
One photograph appeared to show the head, neck and upper torso of a plesiosaur . (Close examination would show a specific head shape and even an eye). Another photo seemed to depict a "gargoyle head", which was later found to be a tree stump during Operation Deepscan.
A few closeups of what is to be the creature's supposed diamond-shaped fin were taken in different positions, as though the creature were moving. But the "flipper photograph" has been highly retouched from the original image. The Museum of Hoaxes shows the original unenhanced photo. Charlie Wyckoff claimed that someone retouched the photo to superimpose the flipper, and that the original enhancement showed a much smaller flipper. No one is exactly sure how the original came to be enhanced in this way.
In 2001, the Academy of Applied Science, known for Robert Rines' photographs, videoed a powerful V-shaped wake traversing the still water on a calm day . Seashells were dated since the Ice Age and proved that the Loch was connected to the sea. Small orange, mushroom-like organisms were also found, never known by science. They also found what looked like a decaying carcass of an animal
Source & References: