An extraordinary video showing transmission workers scaling the terrifying height of a broadcast antenna has become a massive online hit.
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The six-minute film, shot using a helmet camera, follows the progress of two engineers as they scale a 1,768ft pylon.
The video, filmed in the US, had more than 900,000 hits on YouTube.
The progress of the pair is understandably slow, with much of the ascent done without the benefit of a safety harness, as it would impede the climb.
And their work is made more difficult as they have to carry all their tools, weighing up to 30lbs.
The video was originally posted on the industry website www.TheOnlineEngineer.org, before finding its way to YouTube.
It has since been removed following a copyright claim but Sky News Online has permission to show it.
In case anyone is in doubt about the height to which the workers climb, the top of the antenna shown in the film is higher than Chicago's Willis Tower (formerly the Sears Tower), the tallest skyscraper in the US.
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