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Building a Used Water Underground Super Highway

Go behind the scenes of Singapore's Deep Tunnel Sewerage System. PUB's Chief Engineer explains the engineering behind 200km of tunnels built beneath the city.

Last updated 18 June 2026

Building a Used Water Underground Super Highway

Ever wondered how the Deep Tunnel Sewerage System is built?

Go behind the scenes with Our Grandfather Story in this video as PUB’s Chief Engineer Woo Lai Lynn shares the engineering and technology that goes into building the 200km of tunnels beneath our feet.