Goldeneye rogue agent - Golden gun and Cow

On the Hong Kong mission, go to the case where the sniper rifle should be, then when the place blows up kill all of the enemies in the room and go back to where the case was. Next find the stump of a tree standing right side up and on the left it should have part of a wall and then fire. Walk between the fire and the tree while ducking. You should walk right through the wall and then be able to keep walking through the next room and then through the wall on the left. If done correctly you will be in a room with water on the floor and a raft with a cow and a golden gun.