Hole in Antarctica. Hollow Earth Entrance ?
Find it by your own here: https://www.google.co.uk/maps/place/71%C2%B031'31.2%22S+24%C2%B003'53.4%22E/@-71.525332,24.0626423,1223m/data=!3m1!1e3!4m5!3m4!1s0x0:0x0!8m2!3d-71.525332!4d24.064831
or
google -71.525332,24.064831
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