I tried to go thru the tunnel as a 47 NE hunter, no possible way so I tried the swimming part which, surprisingly worked. Just make sure you are in Moonglade and not Darkshore. It's a hell of a swim, so make sure you get out of the water occasionally and be on dry land :)-

I wanted to see how deep the veiled ocean was so I went down, mistake!! It turned back into Darkshore so I went up and it became Moonglade again. I let myself drown and rezzed in Moonglade....