The production crew didn't know they'd even filmed anything unusual until the footage had been reviewed.
Presenter and producer Graeme Stevenson had been filming the opening sequence for the seventh season of the "Colour In Your Life" TV series alongside director Sophia Stacey in Queenstown when, while reviewing the footage for editing purposes, he spotted two objects moving at high speed across the sky in one of the shots.
"In the past week, when editing of the episode was complete Graeme noticed something strange in a wide shot - two objects travelling from left to right of the screen at great speed," the team wrote in a press release. "When the images were slowed to a frame by frame sequence you could see the shapes emerge from the trees and move across the sky, eventually disappearing."
An analysis of the footage seemed to suggest that the objects were moving far too quickly to be birds or even jet planes, requiring them to have been flying at 4,000 miles per hour.
Source: Unexplained Mysteries