Structure hidden under the ice sheet of Antarctica

There's an enormous hidden structure under the ice sheet in Antarctica that is so strange. Nobody is claiming to know what it is but I suspect someone somewhere knows exactly what it is.

Enormous structure hidden under the ice sheet of Antarctica has become visible The structure is 300 meters long, width measures between 30 – 50 meters and walls of 10 meters high. The coordinates are in the image and can be found if you go to Google Earth? This is really cool and what a find eh?

69-53-42-0-S-8-42-22-0-E