HKWW 1965 (Hong Kong Water Works 1965)
Behind Kwun Tong High Level Service Reservoir Garden, there is an abandoned cave that is considered a former air-raid shelter. The cave is now blocked by a gate. Looking in from the window of the gate, there are rusty water pipes and some equipment inside, and the metal word "HKWW 1965" is engraved on the gate.
在觀塘上配水庫的後面，有一個被認為是前防空洞的山洞。山洞已有閘門封鎖，從閘門的窗口看進，裡面有生銹之水管及一些設備，而閘門之上則刻有金屬字「HKWW 1965」。