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❊ FUN FACTS YOU NEVER KNEW ❊ The mammoth Deep Tunnel Sewerage System (DTSS) project consists of two large, deep tunnels crisscrossing the island, two centralised water reclamation plants, deep sea outfall pipes and a link sewer network. The tunnels of the DTSS are as big as a typical MRT tunnel. These tunnels are also built at depths ranging from 20 to 55 metres below ground, which are deeper than a 17-storey building!