Sorry I'm 3 years, late (and you've probably found it by now), but you go to the Prehistoric Ocean, go up to the wall, follow it until it stops dipping downwards. You should see an isolated worm-thing. Go directly downwards.
Sorry I'm 3 years, late (and you've probably found it by now), but you go to the Prehistoric Ocean, go up to the wall, follow it until it stops dipping downwards. You should see an isolated worm-thing. Go directly downwards.