I would like to elaborate on the directions for anyone who is going there for the first time as I got a bit lost trying to follow the existing directions.
The hide is accessed by turning into the first LEFT after exiting the N2 (about 1km), if you have reached Stanger (traffic lights) you have gone too far.
Stay on the dirt road for a few KM with the large dam on your left, it becomes tarmac, keep left and you will arrive at the plant (there is a water treatment pond which might put you off)
The office is to your right in the gated area, the keys can be accessed there.
The dirt track leading to the left off the tarmac (directly after the smelly pond) road is where you want to go.
Maybe 100 meters down this track on the left there are large storage silos, pass these and take the next left.
You will see the dam after about 100M.
Trust this helps.