This is a slightly unusual tunnel. It has a big entrance and the first couple of meters are quite wide, but then leads into a long thiner (usual size) tunnel for about 10 meters. Due to its location facing towards Tai Tam rd. I suspect it was to guard against vehicles and anti-personal.
To get to it you have to get inside the Boy's scouts grounds, opposite HKIS school towards Tai Tam Tuk village, and then follow the Tennis court fence and then head up the valley. About 50m from the Tennis courts.
