Tim Dinsdale

April 23, 1960 - Today was the day that Tim Dinsdale filmed what may be the Loch Ness Monster. The grainy footage ranks up there with the Zapruder film as one of the most analyzed scenes of all time.

Skeptics claim the film depicts a distant boat, but others claim that it's strong evidence of a pleiosaur-type creature. Some analysts say they are actually able to discern flippers.

Dinsdale's original encounter with the mysterious creature began a lifetime quest for more evidence. Over the next 27 years he took part in 56 expeditions and wrote 7 books about the Loch Ness Monster. He claimed to have seen "Nessie" two more times over the years, but he was unable to capture any new photos or video of the creature.

Dinsdale died in 1987, but the hunt for the Loch Ness Monster continues.