The final stage 6 of the Circle Line will cost $1.2 billion per kilometre to build, or five times the average per-km cost of the first five stages.
This means the cost of the 4km stretch, which adds three stations to link Marina Bay to HarbourFront, is expected to be $4.85 billion - more than half what the first five stages cost and exceeds the $3.7 billion projected in 2015.
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