Tim Dinsdale's Loch Ness film

Tim Dinsdale filmed a humped object crossing Loch Ness on 23 April 1960, the last day of his expedition. Later analysts disagreed about what the film shows.

Darren Naish writes that on the sixth and final day of his expedition, 23 April 1960, Tim Dinsdale filmed a humped object moving across Loch Ness, producing what is called the Foyers Bay footage. Dinsdale compared the object to an African buffalo's back. Wikipedia says he had also taken film on the fourth day, 21 April. Wikipedia reports that he mounted his camera, saw the object begin to move, and shot 40 feet of film.

Wikipedia says Dinsdale was convinced the 23 April film showed the monster. The next day he had a dinghy follow a similar track and recorded that on the rest of the film for comparison. After he showed the film around, a newspaper reporter approached him. The Daily Mail published images from it on 13 June, and the BBC programme Panorama screened it.

The film was later analysed twice. Wikipedia reports that the Joint Air Reconnaissance Intelligence Centre published a 1966 report judging the object probably a living thing. The Skeptic, in 1987, replied that Dinsdale had run the camera in brief spells and had to pause two times to wind up the camera's spring motor. The Skeptic says the analysts worked to a shortened timescale, and that with the correct one the object travels as fast as a powered dinghy. The same article adds hearsay that a dinghy like that crossed the loch while Dinsdale filmed.