That was pretty damn scary! I read all 10 pages of it, sort of like a short story. Basically at the end (p. 10) he says he's going to go into the cave again and post again right after he gets back. However the NEXT link on the bottom of 10 just leads back to 10, meaning there is no 11 and he didn't update.
Although scary at first, what I found to be interesting is why he would have a NEXT link before he had a NEXT page? Why would he put a link to the next page when he hasn't written it yet. So I'm thinking it's a bit of a hoax, eh? Good read nonetheless