First go to the side w/ the small pool. now grind the side nearest the boxes and right after you grind do a pop shove it (down & Square) towards the wall. you should go under the level for a second. while your under quickly go into walk mode and you should be walking under the level. you can set cust while under there incase you mess up and go back the right way.
also while under try and grab some rails it looks pretty funny.
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