Good morning. Okay, now we need to secure the corners. This may seem like overkill, but believe me when the wind gets up and the tunnel fill with wind its got to be secured firmly. I made some wooden pegs to go in each corner. As you can see in the picture. Use HEAVY duty pegs, not the light tent pegs, they simply wont cut it. They need to be driven in deep. Next we need to dig a trench along both sides. A spades depth. I know it is probably obvious but keep the earth you have dug out. Unwrap the tunnel along one side as per instructions.