Tunnel Entrance to Gardens Service Reservoir (Hong Kong Botanical Gardens) [1933- ]

When hanging around Albert Road today, I caught a glimpse of something interesting up the hill to the Fountain Terrace Garden in Hong Kong Zoological and Botanical Gardens, a tunnel entrance:

Tunnel Entrance to Gardens Service Reservoir

It is made of concrete, has "HKWW 1931-33“ carved on the top wall.

A quick online search shows that this should be the tunnel entrance to the Gardens Service Reservoir, constructed from 1931 to 1933, together with the staircase to the fountain.

Please also see: https://industrialhistoryhk.org/hong-kong-water-supply-shing-mun-first-section/