plottwist: they all did fall down there and can't get out anymore. they yell for help but everyone who finds them in there just jumping too down there thinking it's a cool beach party.. but in reality it's a deadtrap. soon they will begin to eat the bodys of their dead friends and strangers who fall into this death trap.. this spectacle will go on for 1000 of years till someone gets the idea that they could just dig their way out because it's just fricking dirt.
.. okay maybe i have a too big fantasy..