A collapsed and flooded complex of mining galleries stretches between 600 and 800 metres below the cyclocross World Cup 2025 course in the northern French town of Liévin.
In 1815, after Napoleon's defeat at Waterloo, Dutch King William I gave the go-ahead for constructing the New Dutch Waterline. This defence line extended over a distance of 85 kilometres between the Zuiderzee and the Biesbosch.
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A collapsed and flooded complex of mining galleries stretches between 600 and 800 metres below the cyclocross World Cup 2025 course in the northern French town of Liévin.
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