Pok Fu Lam Reservoir Bunker Ruin? [c.1938- ]

Just before the gate at the end of Pok Fu Lam Reservoir, next to the Watchman's Cottage, is a partially destroyed bunker along the very side of the road. It seems fairly isolated, but not far from the other previously cited bunkers         ( http://gwulo.com/node/4337 ) and a pillbox (  http://gwulo.com/node/13192  ). It somewhat resembles the bunkers mentioned and possibly a Type 2? splinter proof shelter.

It is fairly hard to identify; only a couple rusty hooks that I could make out (it was night) and I was not prepared to go too close since I had seen alot of large Golden Orb Spiders hanging out. 

If anyone has any info, feel free.

Regards