Video footage shows the strange scenes that one user came across while using Google Earth to scour the South Pole.
Passing over the icy continent’s Queen Maud region, they noticed something did not fit in.
A closer look shows what appears to be a vehicle poking through the snow.
Measuring 107 metres in length and 74 metres wide, the object is not consistent with its surroundings.
“There’s definitely something. The straight edges are entirely unnatural”
The finding was uploaded to YouTube channel UFOmania, where they speculated it may have been buried for hundreds, if not thousands, of years.
And viewers were quick to stake their own claims over what it could be.
“There’s definitely something. The straight edges are entirely unnatural,” one claimed.
Another added: “There probably was an ancient civilisation that lived in Antarctica before it was covered with snow.
“So much buried we don’t know about.”
And a third claimed: “Could be a hidden TR-3B.”
The TR-3 Black Manta is the name of a surveillance plane of the United States Air Force, speculated to have been developed under a black project.
It is said to be a supersonic stealth spy plane with a triangular design.
Believers in the programme say it was used during the Gulf War to provide laser designation for Lockheed F-117 Nighthawk bombers.