Shing Mun Reservoir Japanese Tunnels (below redoubt) [c.1943- ]
Up the first flight of stairs on the Maclehose trail going towards Shing Mun Redoubt. At the first flat path section there will be one or two large 'cuttings' into the earth, below the trail. Directly below about 10-15 Meters is the larger, accessible tunnel. This one had lots of bush and vines going into the portal, and had obviously had not been entered in quite a while. The tunnel is of standard width-height of the smaller ones and had a split. Both splits get much more narrow until inaccessible, but still go on. The total length of tunnel accessible is around 30-35 meters. Above this tunnel and to the right around 5-10 meters is the remenants of a mostly collapsed tunnel, which I managed to take a picture of inside. It looks like it is only partially built, like the first cuttings visible from the trail. Seems like the Japanese tested different sites before committing.
Interesting tunnel placemment, since it is facing away from the reservoir, and the direction of attack from the mainland (which both the Shing Mun Redoubt and the large Japanese tunnel system on Smugglers Ridge face).