Cortica River Secret
Go to Cortica River Upstream. Go to the area with vines growing in the corner when you can see your body. Go as close as possible to the wall and the vines and to the surface. Press A and there will be a Gap in the wall. When you go back in the water you can swim through the wall. You're free! The area is infinitely deep and if you poke your head out of the water you can see from outside of the game and look in. Your diving partner (if you came with one) will stare at the spot where you escaped and make attempts to follow you. Pull up the map and the arrow that shows where you are will point at a land outside of the river. Have fun!
If it doesn't work on the first time, try, try again.
Added by: Guest Apr 4th 2013, ID#5475