An impressive natural phenomenon has been misinterpreted by some as evidence of alien visitors.
Steamboat Lake in northwestern Colorado has inadvertently become the focus of a bizarre alien conspiracy this week, all thanks to an audio clip posted up by Colorado Parks and Wildlife.
The short clip contains a recording of some very strange sounds that were picked up at the lake.
The peculiar audio, which has been likened to the sound of blaster fire from the Star Wars movies, is actually produced by the ice as it shifts due to temperature changes.
It is a well known phenomenon and there are countless videos on YouTube featuring similar recordings captured at frozen lakes in Canada, Norway, Sweden and elsewhere.
This hasn't stopped some from claiming that the sounds are evidence of an 'alien base', however.
Conspiracy theorist Scott C. Waring, for example, whose posts are often (and somewhat inexplicably) quoted by major newspapers, has suggested that these sounds are "100% proof" that there is an extraterrestrial base at the bottom of the frozen lake.
"White sphere UFOs have been recorded and eyewitnesses by thousand of residents of Colorado over the last few years," he wrote.
"The signals point to there being an alien base deep below the lake, which amplifies the sounds below due to it being frozen."
Since the natural cause of the sounds is already an established fact, however, this just goes to show how easily such things can be misinterpreted and how 'out there' rumors can gain a foothold online.