Tried following the route and looked for it at the location marked on the map passed to me, of which it's done by other hikers, I was unable to locate the entrance. The dirt track was faint on site.
I have gone through the broken parts of a high fence twice.
It's said to be south of the Shau Kei Wan service reservoir.
Local hikers named it as the Coded Cave of which I have no idea why. It's entrance is small but one can just bend a little bit for entry. Once inside, it's wide enough to fit a taxi. The tunnel looks straight and has a fresh breeze, very comfortable especially in such hot and stuffy summer. Yet, as there seems to be lots of bats poo on the ground, we just ventured for about 20m before turning back, forgetting to sort out why it's so named. Another reason to discourage us was the sound of dripping water from the ceiling on to some kind of puddle.
The bottom of the steps doesn't have a much higher step than the others as in the one at Smugglers Ridge.
