The 1960 Dinsdale film is a famous piece of footage that many claim represents the best cinematic evidence for the existence of the Loch Ness Monster. The footage, shot by Tim Dinsdale from over a mile away, purportedly shows Nessie swimming at high speed, leaving a wake¹. However, there are several alternative explanations for what is observed in the video, other than "I've filmed Nessie!" For example, some skeptics have suggested that the object in the video could be a boat or a group of water birds⁵.
Occam's Razor is a principle from philosophy that recommends selecting the explanation that requires the fewest assumptions⁶. In this case, applying Occam's Razor would suggest that the most likely explanation for the Dinsdale footage is one that does not require the assumption of the existence of an unknown and unproven creature. Instead, it would favor an explanation that relies on known and observable phenomena, such as a boat or water birds. Of course, this is just one way to approach the question, and ultimately it is up to each individual to decide which explanation they find most convincing.