Japanese Tunnel Above Governers Walk near Two Gated Caves [c.1942- ]

This is a small tunnel with two entrances above Governer's Walk below Victoria Peak Pagoda. It is located near the larger gated cave (Left): Gated Tunnel on Governors Walk, below Victoria Peak Pagoda. I was actually guessing that they might be connected, but it turned out the left branch of the gated cave is a dead end despite directing towards this tunnel.

The northwestern entrance seems a good observation site, given that the bushes are cleared out. After all, it has almost the same view as the lookout point slightly above the hill.

Not sure if it is truly made by the Japanese, would someone check it out?

Here are the markers showing the relative positions between tunnel entrances and the gated cave (the markers in the original post are wrong, they are north to the north branch of Governor's Walk).

Inside and outside views of the north entrance.

Inside and outside (both facing tunnel) views of the south entrance.

Inside tunnel facing north:

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I also explored the gated cave below this tunnel. Starting from the gate, you may find it turns left when reaching the end visible from the gate.

Here is the branching area:

Left branch extends, and something unusual on the roof, can you find it?

Very curious about what they are used for, ceremony?

End of left branch.