A mysterious hole in Antarctica has sparked a frenzy of speculation ranging from a top-secret military base to an ancient civilisation. The origin of the bizarre entrance in Antarctica remains unexplained after the ‘cave’ appeared suddenly in 2007 - before disappearing from Google Maps six months later. Conspiracy theories YouTube channel ThirdPhaseFromTheMoon uncovered the mysterious phenomenon.

The video captioned: “Massive Entry Discovered Near Antarctica! Secret Hidden Base?” The sighting comes from Greenwich Island, one of the southern isles in Antartica. Blake Cousins, who runs the conspiracy theorist channel, suggested that the bizarre footage could prove it’s an “entrance to a hollow earth that has been exposed on Google Maps”. In the video exposing the hole, satellite footage in 2007 shows the mysterious cave, but six months later “it no longer exists” on the map. JUST IN: Meghan Markle went against repeated advice after receiving Royal Family warning

A mysterious hole in Antartica has sparked a frenzy of speculation

Six months later the mysterious cave appears to be "covered up"

At the time, the cave measured 74 feet high, and 249 feet wide. According to the YouTubers, this means the cave “could potentially fit hundreds, if not thousands, of people.” His co-host Brett Cousins said: “In a matter of a few months, this is insane. What is going on? “Could it be a natural event, like a snow slide that covered up a cave?” Brett also wondered whether climate change could have melted the ice around the cave, and “unveiled secrets”.

Cousins also pointed to a unusual structure leading to the alleged cave, which resembled man-made steps

The sighting comes from Greenwich Island, one of the southern isles in Antartica

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