Underneath the bustling Chinatown lies a vast labyrinth of interconnected tunnels snaking across Singapore.
The Downtown railway line, which is being built entirely underground, is part of a decades-long push to go down under in search of space.
The result is a subterranean world teeming with activity.
And somewhere in the deeper, darker depths, is the Ministry of Defence's ammunition facility located under Mandai quarry.
But not all of Singapore has rock that is solid enough for cavern developments.
Building and Construction Authority's Geological Office assistant director, Kiefer Chiam, said: "The existing information is quite shallow because it's mainly targeted at infrastructure works like MRT, services or building basements. There isn't much information at deeper levels like 100 metres or more.
"In order to support the underground masterplan, we need to know where the good rocks are."
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