I happened to be wandering around in the Silverwastes, in the cave which Drydock Grotto Waypoint is, when I saw a tunnel. I thought it was made on purpose (it really looked like it) so I glided over and ended up at a cliff with an endless ocean. I was kind of curious and frankly amused so I tried swimming as deep as I could and seeing where in the map I could go like that. I took a bunch of screenshots of my experience; the first one shows relatively where in the map it is.
The last screenshot shows what happened when I tried relogging out of curiosity. I was teleported to the out-of-map rocks above the endless ocean underneath, luckily from which I could escape and didn’t find any other botomless holes in http://sta.sh/21f46txr4up8?edit=1
This was a BIG hole and extremely easy to get to….
