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Well, it's not a hoax. (Unless there's a joker in Google, which has to be possible.)

Here are the co-ordinates. Enter this into Google Earth, and you'll see it. :) It's about half a mile...

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Well, here's more...

Click on the link and zoom in and look around:


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That looks to me like a FLAT shape (not anything elevated)... and the darkish-blue spots look like ice. The key would have been for someone on Google Earth to zoom in from the side, and show the...