I sure this was answered somewhere else on the forum. But here's the directions anyway:
With the power on, take the bus from the farm heading to the power house. When you see the first green street light on the right, you will see a path leading into the corn fields. The path will turn to the left. On the right hand side you will notice a very small path, leading to NDU. It is a small path and is easy to miss, so keep an eye out.
If you make a second left turn in the corn field, you went to far, and will now be heading back to the road.
It also helps to have stamen-up and jug because you will have to fight off the little monster things that jump on your head.