Japanese tunnel around 10 metres deep. Looking at the Lidar scan of HK Island, there should be another tunnel located further up the hill behind and to the right of this tunnel.
Probably for an Antiaircraft gun.
Japanese tunnel next to the Dragon's Trail. Opening is through a small crack through a thin wall of concrete. Around 8-9 feet in length, with a length of around 60 metres. The first section of the cave is quite wide and spacious, with a side chamber to the left, however it narrows into a small squarish passageway for around 5 metres, until you reach a vertical shaft with a rock pile, from which you can climb to reach an exit, which has a clear view of the bay below. The tunnel circumvents the entire ridge, and there is some trash within the tunnel, probably from public works workers.
This tunnel is around 20 metres long, but leads to a dead end. There is an access trench leading to it. I found this tunnel through SCMP's video by the name of "Digging up Hong Kong's wartime past". Looks to be for a antiaircraft gun.
there is a literal Japanese tunnel on this road. I am actually shocked that no one has found it yet. It's probably the only tunnel in Hong Kong, with an intact reinforcement wall and remains of a shutter.
On the way to visit this pillbox, I noticed a large tunnel immediately next to it. It had been gated off, but looks extremely large.
At the entrance to the trail. Rain uncovered it. Didn't explore it, only spotted a big shaft-like tunnel leading down into earth. Probably Japanese tunnel. Next to concrete steps. Very obvious.
This tunnel is the largest of the three I visited today. From video 2:03 you may find trenches, the long trenches are still easily recognizable, surrounding the hills, and the entrance of this tunnel is connected to this trench.
This is the shortest and smallest of the three tunnels on Chiu Keng Wan Shan. It is a dead end with a small room near the entrance, a stone bed is embedded in the room.
The video part for this tunnel starts at 0:30. Sorry for the camera issues you may have to rotate your necks (left 90 degrees) to view it comfortably.
1:08 : Room and stone bed
I was doing a bit of unrelated research when I came across an interesting EIA report (https://www.epd.gov.hk/eia/register/report/eiareport/eia_1252006/html/ex...). It seems that back in 2006 there was a plan to build a Liquid Natural Gas (LNG) receiving terminal at Black Point (https://goo.gl/maps/eTRsMMFojdxTUNu2A), though it appears to have been subsequently abandoned.
