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Tunnel Run Not many people know that when they built the Huguenot Tunnel through the mountains above the town of Paarl in the Western Cape of South Africa, they built a second ‘service’ tunnel alongside it. This tunnel is the same size as the onm ne used as a toll road for traffic, it just isn’t finished off with a smooth concrete lining, merely a gunite shell. A lot like an upside down swimming pool I suppose. So if notClick to read more and to see the event image gallery