If you go to shrouded glade, go near the water behind the headmasters hut, near the 
rowboat in the middle of the water. go around, climb up onto the ledge in the back, 
right next to the goat, and jump into the water, right when your feet touch the water,
press the down key repeatedly. if you did it right you will end up on the bottom of the 
river, you can walk freely underwater! (might take up to three times before it works)
(WARNING)(your friends above water will just see you swimming on the surface when on 
your screen you are underwater).