The area is access sensitive!
From E134 take Rv2690 towards Røyken train station and center. Just after you pass the center, take Heggveien to the left and continue all the way to the top where you get a parking lot on your right hand side.
It is especially important to keep a low profile in the Storhella sector due to the houses that has been put up close to the cave. Make sure not to cross private property.