First - WoW Exploit Community 2012 recommendations!
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At this location in Wintergrasp, which was formerly known for its ability to fish into Wintergrasp waters without being flagged, there is another exploit under the water!
Under this rock outcropping illustrated with pictures, you can STAND on the bottom of the water. In addition to that, you can stand there while breathing, and you can fish “up” to the surface. As you can see from the image, there is a missing water tile, so you can jump down into the bottom of the lake.
Benefits this allows are near-invisible fishing to other players, not to mention a mining node also spawns at this location allowing for possible dual scripting of mining & fishing at the same time!
Pictures indicate that this is not only client-side, showing another player I had confirm and stand and fish with me. Minimap location, West, South, East views shown.
I hope this is helpful, and that this tile is missing on all servers for all to enjoy and abuse!
::UPDATE:: Confirmed on multiple servers.
::UPDATE 2:: EDIT for Clarification. The spot is on the Dragonblight/Wintergrasp border near the Wind Elementals on the south edge of the lower water perimeter. This is SOUTH of the Southeast Workshop. Hope this helps =)