In the jaw-dropping clip, a strange object can be seen seemingly floating off the coast of Ireland.
Like something from a sci-fi film, the object is perfectly circular as it hovers near the shoreline.
The weird object was spotted by a passenger on board a flight travelling from Dublin to Prague last month (December 17).
But after being shared by YouTube conspirator mavi 777 on Sunday (December 30), the bizarre clip has gained more than 1,000 views from theorists and sceptics alike.
And viewers are completely baffled by the shocking footage, with viewers scrambling to find an explanation for the potential alien craft..
“It’s about to go down,” remarked one shocked viewer.
“Awesome footage,” replied another UFO enthusiast.
One viewer claimed to see “some type if dust” pouring out the mysterious object as theories began to emerge.
But some believe they can identify the strange object.
Sceptics claim the alleged “UFO” is actually a large circular reservoir and intake chamber.
Back in November, British Airways pilots were shocked to find “bright lights” flying above their planes across Ireland.
And just last month, UFO believers were horrified to spot an “alien craft” hovering above the Pentagon in Washington, US.