Hey dudes,
I just blinked behind the closed path in Timbermaw Hold and jumped straight to the next lake to swim up - but I forgot to switch from "walk" to "run" and so I ended up in the big emptyness beneath the world. But there was something special: I didn't die, regardless of how deep I fell. So I reached the lake but didn't see my character. With a bit of swimming around I get my character back ontop of the lake ... and then an idea crossed my mind. What about jumping to the Hyjal-lake?
Main thing: Falling through ground doesn't kill you, regardless how deep you are. (Don't know if this is a bug or working as intended)
Could be used for several exploits / exploration
Second thing: Could be possible that "going to Hyjal the swimming way" doesn't teleport you out. Remember that you have to swim up all the way you fall down.
Have fun with this
[ame="http://www.youtube.com/watch?v=lgqC31syNnE"]YouTube - Swimming beneath ground[/ame]