Some eagle-eyed Google Earth uses have discovered what looks to be a huge ship made of ice lying just off the coast of Antarctica.
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One such mystery was highlighted by a self-professed 'Earth watchman' who shared a clip of the find on his YouTube channel after being tipped off by someone else.
The YouTuber, who uses the handle MrMBB333, said the object is located just below New Zealand, around 100 miles off the shore of Antarctica, and that a birds-eye view of it shows 'the outline of a ship'.
The 400ft-long structure does bear a resemblance to a large ship and even appears to have chimneys - though obviously lighting a fire in an ice ship would quickly end in disaster.
"This [ship] here measures over 400ft long - 428ft to be exact," the YouTuber said.
"Whatever that is, that looks like a ship. An ice ship, whatever you want to call it, that's what it looks like: a 400ft yacht just sitting there off the coast of Antarctica."
Naturally the discovery has prompted various conspiracy theories about secrets hidden on the icy continent, with one viewer responding: "I have heard people say that after WWII there has been a lot of movement in Antarctica; like military movement, not sure but it would not surprise me.
"Thank you for sharing such fantastic photos and such interesting and questionable things out there @MrMBB333," they added.
Other viewers praised the YouTuber for sharing his findings, with one responding: "Omg! I LOVVVVE Antarctica content! One of the MOST Interesting/Mysterious places on this Earth!!"
Another viewer wrote: "That does look like a YACHT FOR REAL!!!"
Elsewhere in the video, MrMBB333 also discussed other mysterious finds on the continent, including 'what looks like a torpedo' or 'maybe a submarine', which measures 50ft long.
"That's as big as a five-storey building," he said. "At 50ft long it could very well be a small submarine or some sort. Don't know."
We might have to step out from behind the computer screen to find out for sure, but Google Earth makes clear that the world holds a lot of mysteries.