A) You shouldn't be in an area where fatigue is an issue, although it's very close. Essentially swim til you get the fatigue bar, then back up again a little.
B) The tip about the 'underwater bubbles' or whatever they're called is good too. There should be a bubbling fissure right next to the box you're trying to reach. You're breath should be enough to get down to it and then you can recover by sitting on the fissure until your breath bar is full again before returning to the surface.
Second Edit:
Here's the
map showing where to find the box in Westfall.
Wowhead.com has a good map to show you where to go, but I think it's just north and a lot west of the goldcoast quarry. I'd link to the wowhead info, but it's acting up right now.
As for Illyria, I haven't had that problem.
Edit: When you say that the NPC "isn't talking with you" does that mean that you've tried to talk to her and she won't or that she didn't come up to you all by herself? If you're expecting her to come to you, then you'll be waiting a loooong time. You need to go talk with the NPC to finish (I think). If you've tried that and she won't let you talk to her, then I don't know what the problem is.
Edited, Nov 7th 2007 11:41am by Snardo Edited, Nov 7th 2007 11:52am by Snardo