Looking for a quick way to get your adventurers into a mythic underworld? They will never see this one coming. And it will take more than 50 feet of rope to get out.
And for the record - I think it looks fake, though I might be wrong.
Edit - I've seen more on the story, and it is apparently (and unfortunately) real. I just wondered because of how perfectly circular the hole looks. Sounds like a horrific event.