hey guys i was comeing back to spawn from my nether base and i found this so if anyone knows wut this is plz tell me it scared me to death
Doesn't look like a glitch; see the lava flowing down into the hole from the side? That suggests to me that the chunk somehow got deleted rather than simply not being loaded.
Hmm... That's a great idea! To jump in an unknown, creepy, black hole of darkness surrounded by lava! EDIT: Do not do that!!!!! :O
I've seen one of these on Smp8. Don't jump into it if you are holding anything you don't want to lose. If I remember correctly you will die by jumping into a naturally occurring void in the wild.
I saw one of these on SMP5, I would imagine they are from senior staff screwing around and goofing up then forgetting //undo...