[quote=Frizan]
I actually dove headfirst into lava wearing full diamond armor before(I was VERY, VERY bored, and I had a lot of diamond to spare). I walked around on the bottom until I died. I found a block of diamond and some iron. Not much else.
[/quote]

You obviously didn't do it right. I thought it explained that you had to sacrifice the skin of a pig and the calf of a sheep in order to get to the Gatekeeper, who you can only kill by smooth jazz and sexual innuendos.