A military pillbox structure identified as PB221, located in the territory of Hong Kong, China. The designation 'Pillbox PB221' follows a British military numbering convention (PB = Pillbox) commonly used for small, fortified defensive positions. Given the coordinates and historical context of Hong Kong, this structure may be a remnant from the period of the Battle of Hong Kong in December 1941 or subsequent post-war defensive planning.
The term '機槍堡' (jī qiāng bǎo) in the location name translates from Chinese as 'machine gun bunker,' indicating its presumed primary function. The current state, accessibility, and exact historical details of this specific pillbox are not confirmed by the provided information.