The purpose of the crypt is unknown - it may be a playground for developers, a testing site of sorts, an unfinished instance, or something else entirely. It is interesting to note that using WoW Map Viewer you can see that the crypt runs under Tranquil Gardens Cemetery in Duskwood. This might play a role sometime in the future, or could be a complete coincidence.
This area used to be accessed via dying close to the gate and running through it, but this was changed in Patch 2.0.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
Some people speculate that is a lower portion of Karazhan, as some lore indicated Karazhan has a lower half. But the architecture does not seem match with Karazhan in the slightest bit.
Inside the crypts, there's a persistent heartbeat. There are also many subzones such as Tome of the Unrepentant, The Upside-down Sinners, Well of the Forgotten and Pauper's Walk.
Why was the crypt not opened? | 2014-01-24 07:29 |Bashiok
Oh yeah, I remember that! Haven't seen a screenshot in quite a while. Not sure I know the story on it but knowing our development processes back then there tended to be a lot more stuff made that we just didn't use. I can't imagine the game rating rumor is accurate, because if it was content we wanted to use we'd just take out the upside-down sinners or whatever the issue was and use it for whatever it was we wanted to do with that space. It's not like they're permanent fixtures. Fun rumor though! :) More likely we just changed our minds.