tofska: The area is quite exposed now, and the cache's hide has been well dug up.
When this cache was placed, the Beveridge to Arataki track didn't even exist. I discovered the well overgrown cuttings by accident in an exploratory bush-bash. On finding the Monkey Drive tunnel, it was clear that something used to be here. At that time you could walk to the end of the tunnel, which was blocked up, and scare the passers-by on Exhibition Drive by poking your arm out of the ventilation pipe! :)